Ответить на вопрос! why do adults often see the age between 13 and 19 as 'difficult' ?

That age is the most difficult for children a their parents, as children are trying to show their independence and get free of their parents. most part of adults do not want to let their children try to be independent, as they are shure, that it is very dangerous.

children want to prove that they are adults.  they become angry and they can hate their parents, but it is not always. they can begin smoke. they can be lazy. when they were 5 years old parents can to give them any toy, but when they are 13 they want to have an expensive device. 

Russia is the biggest country in the world. its area is 17,125,407 km2. it is famous for siberia, they are also often referred to as the lungs of the planet. russian multi-ethnic country, there live a lot of nationalities. the russians are very patriotic people, they never say anything bad about their country. more russia is famous for its writers and poets, the most famous is alexander pushkin. i love russia.перевод россия самая большая страна в мире. её площадь равна 17 125 407 км2. она знаменита сибирью, их ещё часто называют лёгкими планеты. россия многонациональная страна, здесь живут достаточно много национальностей. россияне патриотичный народ, они никогда не скажут ничего плохого о своей стране. ещё россия знаменита своими писателями и поэтами, самый известный это александр сергеевич пушкин. я люблю россию.

Igo to the cinema twice a week -- я хожу в кино дважды в неделю. he reads a book everyday -- он читает книгу каждый день. they go for a walk three or four times a week -- они ходят гулять три или четыре раза в неделю. kate likes collecting postcards -- кейт нравится коллекционировать открытки.we don’t know what to tell the teacher -- мы не знаем, что сказал учитель. joe doesn't like playing piano -- джо не любит играть на пианино. my family visits museum once a month -- моя семья посещает музей раз в месяц. do you like pizza? -- ты любишь пиццу? does diana speak english better than you? -- диана говорит по- лучше, чем ты? i go to gym many times a year -- я хожу в спортзал много раз в год.