He sat there, doing nothing else （）.
A. but to laugh
B. than laughing
C. than laugh
D. but laughed
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I then listened to the boy （） the lesson written on the blackboard.
A. read
B. reading
C. to read
D. having read
Let’s stop to take up another subject, （） we
A. oughtn’t
B. don’t
C. shall
D. should
It was essential that all the necessary documents （） in to the personnel office.
A. hand
B. be handed
C. are to hand
D. must he handed
If he （） the storekeeper’s scissors, he would have forgotten to buy a pair.
A. would not see
B. has not seen
C. had not seen
D. were not to see
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