English isn't easy, ____ we like it.
A. but
B. and
C. or
D. so
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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
I ____ my homework when Mike came last night
A. do
B. was doing
C. am doing
D. have done
He began to ____ English three years ago.
A. learn
B. learns
C. learned
D. learning