单项选择题

It is difficult ______ a world record and even more difficult to ______ it.

A．keeping, set
B．keep, set
C．set, keep
D．to set, keep
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单项选择题
The doctor ______ my forehead and said, Your forehead ______ hot.
A．felt, feels
B．felt, was felt
C．feels, felt
D．feels, is felt
单项选择题
Mary ______ her keys in her office and she had to ______ out of the house.
A．forgot, keep
B．forget, keep
C．left, be kept
D．leaved, be kept
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