23. There are some dangerous fishes in this river, and I’ve warned Jack ______ here.

  A. not to swim          B. to not swim             C. swim not to             D. to swim not

22. Beth has a beautiful ______. Listen! She is singing very well.

  A. voice                   B. look                        C. sound                      D. smell

21. Please ______ the lights when you leave the classroom.

  A. turn in                 B. turn up                    C. turn off                   D. turn out

20. ?Why didn’t Alice come to the party last night?

   --I don’t know ______.

  A. why didn’t she     B. why she didn’t C. why did she             D. why she did

19. There are about two ______ students in the newly built school.

  A. thousand              B. thousands         C. thousand of              D. thousands of

18. I usually go to school ______ bike, but sometimes I go to school ______ foot.

  A. with; on               B. on; by              C. on; with                  D. by; on

17. Ted’s mother kept telling Ted not to tell lies, but ______ didn’t help.

  A. which                  B. it                     C. she                          D. he

16. ?Where is mom now?

   --I’m not sure. She ______ be in the kitchen.

  A. shall                    B. may                 C. need                        D. must

15. English ______ in Canada, Australia and New Zealand as well as America and Britain.

  A. speaks                 B. is speaking        C. is spoken                 D. spoke

14. ?Will you watch the World Cup match this year?

   --No, but I ______ several World Cup matches since I was a small child.

  A. had seen              B. see                    C. was seeing               D. have seen