How often ____ ____ to the park when you were in Tianjin?
A. do; go
B. did; go
C. will; go
D. have; gone
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He asked ____ they needed some more tea.
A. that
B. what
C. whether
D. which
Everyone must ____ the classroom ____.
A. kept; cleaned
B. keeps; clean
C. keep; clean
D. keep; cleaning
This work is ____ for me than for you.
A. difficult
B. the most difficult
C. most difficult
D. more difficult
It is one o'clock, but his father hasn't come back ____
A. already
B. still
C. too
D. yet
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