Replace the infinitives by the past perfect, the past perfect continuous or the past indefinite. 1 they ( to drive ) in the car for many hours before they ( to come ) to the crossroads.2 the scientists ( to carry ) out dozens of experiments before they ( to achieve ) satisfactory results.3 the violinist ( to practise ) the passage hour after hour until he ( to master ) it at last.4 at last the postman ( to bring ) the letter which i ( to expect ) several weeks.5 he told me he ( not to see ) much of her since he ( to move ) to another place.6 when i ( to arrive ) he ( to stay ) at the same hotel where we first ( to meet he ( to tell ) me he ( to wait ) for me for some time already.7 he ( to consult ) his watch nervously several times before he ( to see ) her at the end of the platform.8 he ( to write ) and ( to tear ) up more than one letter when at last he ( to find ) the necessary form of address.9 my watch ( to ceep ) good time before i ( to drop ) it. 10 at the end of the week the fishermen ( to think ) they ( to sail ) long enough to reach the shore, and as there ( to be ) no land in sight, they ( to understand ) that they ( to lose ) their course and ( to follow ) the wrong route. 11 it ( not to rain ) for more than two month, and the fruits ( to fall ) before they ( to become ) ripe.

1.Had been driving, came.2.had carried, came3.had practised, mastered.4. Had brought, exspected.5. Hadnt seen , moved.6. Arrived, had been staying, met.7. Had consulted, saw.8. Had written and tored, found.9. Had ceeped, droped.10.thought, sailed, was, understood, lost, followed, 11.had been raining, had fallen, became.

As long as species have been evolving, species have been going extinct. It is estimated that over 99% of all species that ever lived have gone extinct.Nowadays many animals are facing extinction such as Siberian (Amur) Tiger, Loggerhead Turtle, Northern Bald Ibis, Lion-Tailed Macaque, Mandarin Duck, Mountain Gorilla, Jackass Penguin, Blue Whale, Komodo Dragon, Golden Lion Tamarin, Californian Condor.Some people may ask “Why bother with conservation?” We now realize that it is important to maintain the planet’s biodiversity, the variety of animal and plant life, abundance and wild habitats.The more species disappear, the more entire eco-systems become defenseless and would eventually fall apart as the links in the food chain become broken. For example, certain animals only eat certain plants and those plants may need that animal to pollinate it or spread its seed. Without one, the other is also likely to die out.People all over the world are working to help some endangered animals from extinction. There are conservation organisations which try to make people aware of the problems facing wild animals. Some of the ways in which they are being saved include habitat protection, captive breeding, setting up nature reserves and parks and using alternative products in place of products from rare animals.Today, the problem of extinction is one of the most important. I think the first step towards saving animals is to learn as much as possible about them. If we know where and how they live, and what they need to survive, then it will be easier to help them.

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Future Of Our Planet Будущее нашей планеты
The future of our planet is vague. At the same there are many down-to-earth predictions, which seem to work. At the moment we live in the new era - the 21st century. Many centuries before people have lived in harmony with nature and its riches. Today, we are facing lots of global problems, which should be approached seriously. Otherwise, our planet can turn into an uninhabited space. Most of these problems are the result of technological progress and rapid scientific development. On the one hand, it’s good to have modern advances, such as newer computers, house robots, and office equipment. On the other hand, to launch and maintain all these machines, we need lots of natural resources. Besides, the growing number of plants is extremely harmful for the surrounding nature. As I see the future of our planet, we’ll have an over-polluted environment. That’s why we’ll have to spend most of the time locked in our flats and houses. These are my personal speculations, which might be right or wrong. I see lots of mighty skyscrapers in the future. They will be equipped with all the necessary facilities, for example, with grocery stores, kindergartens and schools, fitness centers and hairdressing saloons. They will remind a city of full value in one building. Speaking about transport, I think that with such technological progress we will soon have flying cars and taxis, which will pick up the passengers from their own flats. Moreover, I think that vehicles will be computerized and self-operated, which will leave the drivers unemployed. There will be lots of new professions in the future, for example, a telesurgeon, a robot counselor, a space tourist guide, a cloning regulator etc. It sounds bizarre, but this can be our nearest future, and we should think about it today. Будущее нашей планеты немного расплывчато. В то же время есть много реалистичных прогнозов, которые сбываются. На данный момент мы живем в новой эре - 21-м веке. Много веков назад люди жили в гармонии с природой и ее богатствами. Сегодня мы сталкиваемся со многими глобальными проблемами, к которым нужно подходить серьезно. В противном случае, наша планета может превратиться в необитаемое пространство. Большинство из этих проблем являются результатом технического прогресса и быстрого развития науки. С одной стороны, современные достижения, такие как новейшие компьютеры, домашние роботы и офисная оргтехника, это хорошо. С другой стороны, для создания и поддержания всех этих машин требуется много природных ресурсов. Помимо этого, возрастающее число заводов чрезвычайно вредно для окружающей природы. Я вижу, что в будущем наша планета станет загрязненной. Вот почему мы будем проводить большую часть времени в своих квартирах и домах. Это мои личные догадки, которые могут быть правильными или нет. Я вижу в будущем множество могучих небоскребов. Они будут оснащены всеми необходимыми удобствами, например, продуктовыми магазинами, детскими садами и школами, фитнес-центрами и парикмахерскими. Они будут напоминать полноценный город в одном здании. Говоря о транспорте, я думаю, что с таким техническим прогрессом у нас скоро будут летающие автомобили и такси, которые будут забирать пассажиров из собственных квартир. Более того, я думаю, что транспортные средства будут компьютеризированы и самоуправляемы, что оставит водителей без работы. В будущем будет много новых профессий, таких как удаленный хирург, советник по роботам, космический гид, регулятор клонирование и т.д. Возможно, это звучит странно, но это может быть наше ближайшее будущее, и мы должны подумать об этом сегодня.