32. Earlier that day, when they crossed the Rocky Mountains, they ____ to catch sight of some mountain goats and even a grizzly bear and an eagle.

　 A. tried　 B. had　 C, managed　 D. surrounded

31. It is so wet there that the trees are extremely tall, some _____ over 90 metres.

　 A. measure　 B. measured　 C. measures　 D. measuring

30. Skiing in the Rocky Mountains and sailing in the harbour make Vancouver one of Canada’s most popular cities _____.

　 A. to live　 B. to live in　 C. lived　 D. living

29. People say it is Canada’s most beautiful city, _____ by mountains and the Pacific Ocean.

　 A. surrounding　 B. surround　 C. to surround　 D. surrounded

28. The thought _____ they could cross the whole continent was exciting.

　 A. that　 B. what　 C. which　 D. why

27. We watched, amazed as fire _____ on the outside of the spaceship as the earth’s gravity increased.

　 A. broke up　 B. broke out　 C. broke in　 D. broke away

26. Walking does need a bit of practice _____ gravity has changed.

　 A. as if　 B. in their turn　 C. now that　 D. as a result of

25. They multiplied and filled the oceans and seas with oxygen, _____ encouraged the later development of early shellfish and all sorts of fish.

　 A. that　 B. where　 C. when　 D. which

24. _____ is even more important is that as the earth cooled down, water began to appear on its surface.

　 A. As　 B. That　 C. What　 D. Where

23. It was not immediately obvious _____ water was to be fundamental to the development of life.

　 A. what　 B. that　 C. when　 D. why