22、The robbers forced the door_________.
A. open         B. opened　　C. to be open        D. opening

21、—This is the first time I _________ my picture with my own hands.
—It’s time that you _________ a picture for me.
A. have taken; took       B. took; took　　C. took; will take       D. will take; have taken

20、_________ for his good skill, this doctor has a lot of visitors calling for help all the year round.
A. Knowing        B. Known　　C. To know        D. To have known

19、With the rapid growth of population, the city _________ in all directions in the past five years.
A. spreads        B. has spread　　C. spread         D. had spread

18、In the reading room, we found her _________ at a desk, with her eyes _________ on a book.
A. sitting; fixing       B. sit; fixed　　C. sitting; to be fixed      D. seated; fixed

17、—Hey, Mr. Smith, you are wanted on _________ phone.
—Who is calling?
—_________ Mr. Green. I don’t know who he is.
A. /; A         B. the; /　　C. the; A         D. /; /

16、How long can you hold your breath _________(在水下)？

15、Let’s go to the beach to _________(洗澡).

14、How does sea water s_________ clean?

13、The oceans of the world are s_________ because they contain 3.5% of salt.