The first zoos kept (54)ответ
animals in separate cages or in areas with fences or walls around them. Most of them, however, did not like living alone. They missed the excitement and thrilling life that they had in nature.
Today, zoos try to create an environment that is more natural to the animals and the visitors (55)ответ
watch them. It looks more like real nature (56)ответ
rocks, plants and trees that animals would normally encounter. Instead (57)ответ
being kept in cages, many zoos have large areas (58)ответ
animals can move around freely and do the things that they would also do in the wild.
Many zoos put animals of the same kind into the same areas. For example, lions, tigers and other large cats may be kept together in some exhibits. Animals that live in the same climate or biome, for example grasslands or deserts, may also be grouped together.
(59)ответ
most cases, visitors can observe the animals but not touch them. Some exhibits use glass plates, (60)ответ
keep visitors and animals apart through rivers, pits or other natural barriers.​

1) Does he study at the college? He doesn't study at college. 2) Do they play football well? They don't play football well. 3) Did we usually watch TV in the evening. We didn't usually watch TV in the evening. 4) Does our teacher ask many questions? Our teacher doesn't ask many questions. 5) Did Nick work at school last year? Nick didn't work at school last year. 6) Shall we go to St. Petersburg in summer? We shall not go to St. Petersburg in summer. 7) Did they go to Moskow? They didn't go to Moscow. 8) Will he visit us some day? He won't visit us some day. 9) Do they study English? They don't study English. 10) Did my sister finish her work? My sister didn't finish her work.

Объяснение:

1. His sister studies at school.    Present Indefinite

2.You will see him tomorrow.      Future Indefinite

3. I went to the college at 7 o'clock.    Past Indefinite

4. Who took my book?       Past Indefinite

5. They work every day.      Present Indefinite

6. I shall read this book next week.     Future Indefinite

7. We translated this text last lesson.      Past Indefinite

8. What books does he usually read?     Present Indefinite

9. She will visit you soon.     Future Indefinite  

10. We shall be good specialists in some years.      

Future Indefinite

11. My father went to Moscow yesterday.        Past Indefinite

12. Who knows him?     Present Indefinite

13. At last she opened the window.      Past Indefinite

14. You'll take this book in the library.      Future Indefinite

15. Do you often visit your parents?      Present Indefinite

16. He knew these words well.       Past Indefinite

17. Shall I read this text?       Future Indefinite

18. His children like music.       Present Indefinite

19. Did they go to the village?     Past Indefinite

20. Tomorrow we'll go to the cinema.     Future Indefinite

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