My wallet is nowhere to be found. I （） it when I was on the bus.
A. must drop
B. had dropped
C. must have dropped
D. should have dropped
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A new technique （） worked out, we set about our project.
A. being
B. to be
C. having
D. having been
He didn’t seem to mind （） TV while he was trying to study.
A. them to watch
B. that they watch
C. their watching
D. them watch
If only he （） what I tell him, but he won’t.
A. had done
B. would have done
C. would do
D. has done
Shining down out of the blue sky, （）.
A. the sun burnt their pale skins
B. the sun burning their pale skins
C. they were burnt by the fierce sun
D. their pale skins were burnt by the sun
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