| Your bedroom is very dirty. You must _____. |
A. clean up it B. clean it up C. clean them up D. clean up them |
| Every year, _____ fishes are killed by the polluted water and many people are made sick by the polluted air. |
A. thousand of B. thousands of C. two thousands D. two thousands of |
| Miss Gao said she went to see the doctor yesterday, and _________. |
A. so she did B. she did so C. so did she D. she did it |
| —Where is Zhangqiang? —She _____ to Shanghai with her family _____ a holiday. |
A. has gone; for B. has been; during C. is going; on D. went; in |