We ______ to the Great Wall several times.
A. go
B. went
C. have gone
D. have been
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It seemed that the old man ______ for something over there.
A. looks
B. looked
C. was looking
D. has looked
He was sure that he ______ his wallet in the office.
A. left
B. would leave
C. had left
D. has left
You must study hard if you ______ want to fail the exam.
A. won’t
B. don’t
C. haven’t
D. hadn’t
"I’m afraid you can’t sit here." "Sorry, I ______ know."
A. don’t
B. can’t
C. won’t
D. didn’t
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