35.(　 ) If the teacher ________me to solve the problem next time, I could try my best.

　　　　 A. asks　　　 B. is to ask　　　　　 C. were to ask　 D. was asking　 .

34. ________ English can be difficult to learn, it is a very useful tool for communication.

　　　　 A. While　　　 B. When　　　　　 C. As　　　　 D. Since

33. It has been raining every day so far. I hope tomorrow will ________ fine.

　　　　 A. turn up　　 B. turn to　　　　　 C. turn out　　 D. turn into.

32. A robot is a machine ________ to do jobs instead of human beings.

　　　　 A. design　　　 B. designed　　　 C. to design　　 D. designing

31. The lack of rain could ________ disaster for the farmers in the mountainous areas.

　　　　 A. spell　　　　 B. develop　　　 C. advocate　　 D. conduct

30. The teacher gave the order that the students ________ the clothes every week by themselves.

A. washed　　　 　 B. must wash　　　 C. shall wash　　　　 D. wash

29.Though ______________, climbing does much good to us.

A. to be tiring　　　 B. tired　　　　　 C. tiring　　　　　　　　 D. to be tired