Seldom _____ her homework in the morning.
A. my sister does
B. does my sister
C. does my sister do
D. my sister do
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Farmers had to work hard in fields, ____ in the factory.
A. works did so
B. so do workers
C. workers work so
D. so had workers
John has been to the Great Wall.____________.
A. So he did
B. So did he
C. So he has
D. So has he
Only recently ____to deal with the environmental problem.
A. something has done
B. has something done
C. has something been done
D. something has been done
Hardly _______ one problem settled_______another appeared.
A. have I had; than
B. have I had; when
C. do I had; than
D. had I had; when
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