The old ____ told a joke to her children and they all laughed.
A. man
B. men
C. woman
D. women
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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
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