39. By the year 2100, our own planet is becoming more crowded and more crowded.

　 A　　　　　　　　 B　　　　 C　　　　　　　　　　 D

38. I don’t think she is our new teacher, ________ ________?(改为反义疑问句)

37. It is too cold for us to go out at night on Mars. (改为同义句)

　 It is ________ ________ ________ ________ can’t go out at night on Mars.

36. I’m too short to be an astronaut.(改为同义句)

I’m ________ ________ ________ ________ be an astronaut.

35．(　 )At the science museum，the boys and girls get to know__________.

　　 A．what is the spaceship like　　 　　　　B．what the spaceship looks like

C．how the spaceship looks 1ike　　 　　　D．how does the spaceship 1ook like.

34. The headmaster stopped　 ______ to me because there was a call for him.

A. talking　 B. to talk　 C. saying　 D. to say

33. About　 ______ of the books in our school library are written in Chinese.

　　 A. four-fifth　 B. four-fifths　 C. fourth-fifths　 D. fourths-fifth

31.(　 ) Millie makes her cousin　 ______ the flowers every day.

A. waters　 B. watering　 C. water　 D. to water

(　 )32 ---How much did you　 ______ all those things?　 ---About 300 yuan.

A　 give　 B. cost　 C. spend　 D. pay for

30.(　 ) We have so many kinds of guitars for you ______.

A. to choose　 B. to choose from　 C. to be chosen　 D. to be chosen from

29.I think he　 ______ to finish the hard work in a day or two.

A. can’t　 B. will　 C. is able　 D. isn’t able