He______ his homework now.
A. does
B. is doing
C. did
D. has done
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Bob was _______the fashion when I called him last night.
A. watch
B. watching
C. watches
D. watched
The old ____ told a joke to her children and they all laughed.
A. man
B. men
C. woman
D. women
The cadets _________a new lesson when team leader came in.
A. have
B. having
C. were having
D. are having
——What are you doing? —— I am_______ a letter.
A. writing
B. written
C. wrote
D. write