Mr Li asked me ____ fishing with him.
A. go
B. to go
C. goes
D. going
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He ____ in this school since 1995.
A. study
B. studying
C. has studied
D. will study
English isn't easy, ____ we like it.
A. but
B. and
C. or
D. so
I ____ my homework when my father came in.
A. do
B. will do
C. was doing
D. does
----Can you write a letter in English? ----No, I ____.
A. may not
B. mustn’t
C. can't
D. needn't