——What are you doing? —— I am_______ a letter.
A. writing
B. written
C. wrote
D. write
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Tom is not _______his homework now.
A. doing
B. do
C. does
D. did
______he ______it to you then?
A. Does explain
B. Did explains
C. Does explains
Did explain
We _______ a lot of homework yesterday.
A. has
B. have
C. had
D. having
She sang many English songs at the party ___________.
A. every time
B. last night
C. tomorrow
D. each time