12. All _____ is needed is a supply of enough water.
A. the thing
B. that
C. what
D. which
正确答案：
13. We accomplished the task _____ our own.
A. with
B. at
C. of
D. on
正确答案：
14. I saw a boy ____ in front of the building.
A. stand
B. to stand
C. standing
D. stood
正确答案：
15. You may go fishing if your work _____.
A. is done
B. will be done
C. has done
D. have done
正确答案：
16. They _____ pains to win this contest.
A. make
B. take
C. do
D. give
正确答案：
17. The woman and her husband______ in the same office.
A. works
B. working
C. work
D. has worked
正确答案：