-What are they doing? --They ____a song.
A. listen
B. are listening
C. sing
D. are singing
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Most of the children enjoy ______ computer games.
A. play
B. playing
C. played
D. to play
The nurse spent the whole morning ______with the patient.
A. talk
B. talks
C. talked
D. talking
The boys ______ a new lesson when Mary came in.
A. have
B. having
C. were having
D. are having
We __________ in a factory these days.
A. are worked
B. are working
C. am working
D. working
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