Present Perfect Tense 1. She (get) a new bicycle today 2. I (aiready see) this film. 3. Lisa (jast arrive) from Berlin 4. Nick (never be) to Rome 5. They (not copy) the text yet 6. Tom (lose) his passport. 7. ... you (already buy) an umbrella? 8. We (just meet) our friends. 9. Where ... you (already be)? 10. You (just make) a mistake. 11. ... you (ever eat) mango? 12. Tim (already buy) two new CDs. 13. What ... you (see) in Paris? 14. I (never climb) the mountains. 15. ... you ever (be) to the dentist?

1. she has got a new bicycle today

2. I have already seen this film

3. Lisa has just arrived from Berlin

4. Nick has never been to Rome

5. They haven't copied the text yet

6. Tom has lost his passport

7. Have you already bought an umbrella

8. We have just met our friends

9. where have you already been

10. you have just made a mistake

11. have you ever eaten mango

12. tim has already bought two new CDs

13. what have you seen in Paris

14. I have never climbed the mountains

15. have you ever been to the dentist

1.The population growth is the main cause of environmental pollution.
2. In the twentieth century, the population of the planet has increased more than ever in the history of human existence.
3. If this trend continues, in the next century the world population will double.4. Before 1900, many children born did not survive to adult age and, thus, could not have children of their own.5. In 1950 the average life expectancy in the U.S. was 57 years.6. People in these parts of the world began to immunize children have reduced child mortality.7. Already there are signs that in some parts of the world, population growth begins to decrease-Xia.8. In countries where the population grows at 2% per year, the number of inhabitants will advai place every 34 years.9. If the population growth is high in these and other countries, attempts to reduce the rate of growth will be in vain.10. Russia's population is declining sharply, as is born less and less children

1.The population growth is the main cause of environmental pollution.
2. In the twentieth century, the population of the planet has increased more than ever in the history of human existence.
3. If this trend continues, in the next century the world population will double.4. Before 1900, many children born did not survive to adult age and, thus, could not have children of their own.5. In 1950 the average life expectancy in the U.S. was 57 years.6. People in these parts of the world began to immunize children have reduced child mortality.7. Already there are signs that in some parts of the world, population growth begins to decrease-Xia.8. In countries where the population grows at 2% per year, the number of inhabitants will advai place every 34 years.9. If the population growth is high in these and other countries, attempts to reduce the rate of growth will be in vain.10. Russia's population is declining sharply, as is born less and less children.