37. A. us 　　B. them 　C. him 　　D. her

36. A. home 　　B. bank 　C. shop 　D. river

34. It is said that potato chips ___ by mistake about a hundred years ago. A. invent 　　B. invented 　C. are invented 　D. were invented

33. His parents were worried that he ___ too much time chatting on line. A. spent 　　B. cost 　　C. paid 　　D. had

32. Sam enjoys ___ stamps. And now he has 226 of them. A. to collect 　　B. collected 　　C. collects 　D. collecting

31. Rosa likes music, ___ is quiet and gentle. A. when B. that 　　C. where D. who

30. I don’t know ___ tomorrow. Can you tell me? A. when we started 　　B. when did we start C. when we will start 　　D. when will we start

29. –What’s your brother doing in his room now? -He ___ a kite. 　　 A. makes 　B. made　 　C. is making 　　D. will make

28. ---Mum, ___ I play computer games?

---Yes, you can. But you have to finish your homework first. A. must 　B. may 　C. will 　D. need