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 computer of the airports have helped people greatly. ______, more people travel by plane in Chin
A．A. In factB. At leastC. At one timeD. As a result
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
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