1. I don’t know when __________.

   A. will the train leave                           B. the train will leave

   C. would the train leave                        D. the train leave

30. I ________a volunteer for the 29^th Olympics, so I want you _______ me with my English.

   A. chose , help  B. am chosen , to help   C. was chosen, helped    D. choose, helping

29. You should finish your lessons _______ you go out to play.

   A. before        B. after                              C. when               D. while

28. ---- Listen! Helen is singing in the next room.

   ---- It      be Helen. She has gone to Beijing.

   A. can’t          B. mustn’t                   C. may                  D. should

27. ----      have your parents been abroad?

   ---- Only once.

   A. How long           B. How far                        C. How many times              D. How often

26. --How long have you _______ the motorbike?

   ---For about two weeks.

   A. bought              B. had                        C. borrowed                D. lent

25. I       in Beijing since 1956.

   A. will live            B. live                        C. have lived         D. lived

24. The students will go to the Great Wall if it       tomorrow.

   A. isn’t rain           B. doesn’t rain             C. don’t rain          D. rain

23. Look, they______ a good time.
   A. has                B. have                    C. are having        D. had

22. We must make the earth a happy home______ both human beings and animals.

   A. for                   B. with                        C. by                    D. at