A. nice
B. nicer
C.
nicest D. the nicest
27. Miss Lin ________ a lot of work for the poor area since 10 years ago.
A. does
B. did
C. has done
D. will do
28.I’ll send you a Wechat as soon as I ________ in Canada.
A. arrive
B. arrived
C. am arriving
D. will arrive
29.--________ have you been in China? –For three years.
A. How much
B. How long
C.
How often D. How far
30.-- I haven’t been to the History Museum, what about you?
-- _________. Let’s go to one tomorrow.
A. Me, too.
B. I have
C. Me neither
D. So do I
31.Doctors tell us ________ our hands often
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