1、You are waiting at a wrong place
A.who
B.which
C.where
D.that
2、Not until I began to work ________ how much time I had wasted
A.didn’t I realize
B.did I realize
C.I didn’t realize
D.I realized
3、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
4、While he ________ his homework, his mother came in
A.does
B.did
C.was doing
D.do
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