(   ) 3. Please wait for about three hours. The rooms need to        at once.

   A. clean   B.cleaned

   C.  be cleaned D.to clean

(   ) 2. With the         of society,our environment is becoming worse and worse. So we should do what we can        our environment,

   A.develop，protect

   B.developing  to protect

   C.development protect

   D.development;to protect

 (   ) 1.The man stopped       when he saw a sign of danger.

   A. drive   B. to drive

   C.  driving   D. driven

8.The        (wood) chairs and desks aren't heavy and we can move them away easily.

7.She doesn't like the       (north) cities because it's very cold there.

6.The new teaching        (build) in our school  was built two years ago.

5.I        already        (finish) my homework.

4.What music do you listen to        (recent) ？

3.The        (pollute) of the swamps(沼澤地) is worse than before.

2.        (recycle) paper is really easy for us all,