——I hope the children won’t touch the dog.——I’ve warned them ______ .
A. not
B. not to
C. not touch
D. not do
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When ______ why he walked in without permission,he just stared at us and said nothing.
A. been asked
B. asked
C. asking
D. to be asked
The man kept silent in the room unless ______ .
A. spoken to
B. spoke to
C. spoken
D. to speak
He was often listened ______ in the next room.
A. sing
B. sung
C. to sing
D. to to sing
What’s troubling them is ______ enough experienced workers.
A. that they have to
B. they have not
C. their not having
D. not their having
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