43. A. before　　　 　　　　 B. ago　　　　 　　　　　 C. since

42. A. an 　　　　　　　　　 B. a　　 　　　　　　　　 C. the

41. A. in 　　　　　　　　　 B. on 　　　　　　　　　 C. to

40. A. turn 　　　　　　　　 B. grow　　　 　　　　　 C. become

39. A. clean　　 　　　　　　 B. dirty　　　 　　　　　 C. cool

38. A. let　　 　　　　　　　 B. found　　 　　　　　　 C. made

37. A. small　　　 　　　　 B. big　　 　　　　　　　　　　　　 C. large

36. A. little　　 　　　　　 B. a little　　 　　　　　　 C. a few

35. -Are you going to have a sports meeting tomorrow?

-Yes, but I’ll call Kate to make sure _______.

A. why to start　 　　　　　B. when to start　 　　　C. what to start

Choose the best answer to complete the passage.

　 Australia is the largest island in the world. It is 　36　 　smaller than China. It is in the south of the earth. Australia is big, but its population is 　37　 . The population of Australia is nearly as large as that of Shanghai.

Enough laws have been 　38　 　to fight against pollution. The cities in Australia have got little air or water pollution. The sky is blue and the water is 　39　 .You can clearly see fish swimming in the rivers. Plants 　40　 　very well.

Last month we visited Perth, the biggest city 　41 　　Western Australia, and went to a wild flowers’ exhibition (展览). There we saw 　42　 　large number of wild flowers we had never seen 　43　 . We had a wonderful time. Perth is 　44　 　for its beautiful wild flowers. In spring every year Perth has the wild flowers’ exhibition. 　　45 　　visiting Perth, we 　46　 　a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us 　47 　all our things and run back to the car as quickly as we could. There were about three hundred sheep 　48　 　towards us down the path.

Australia is well-known for its sheep and kangaroos. After a short drive from 　49 　　town, you will find yourself in the 　50 　　of white sheep. Sheep, sheep, everywhere are sheep.

34. I’m waiting for my sister. I won’t go to see my uncle until _______.

A. she comes 　　　　　　　　　 B. she will come　 　　　　 C. she doesn’t come