1.You have no idea ________ I went through to get this task finished in time.
A. which
B. that
C. whether
D. what
2.He talked about the classmates and the school ________ he had visited.
A. who
B. that
C. which
D. about which
3.While he ________ his homework, his mother came in.
A. does
B. did
C. was doing
D. do
4.If the new safety system ________ to use, the accident would never have happened.
A. had been put
B. were put
C. should be put
D. would be put
5.You are waiting at a wrong place. It is at the hotel ________ the coach picks up tourists.
A. who
B. which
C. where
D. that
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