单项选择题

The scientist was so absorbed in his work that he was not ______ of the fire that was spreading to his room.

A．adequate
B．alive
C．aware
D．awake
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单项选择题
It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
A．shall be
B．be
C．are to be
D．must be
单项选择题
In the advanced reading course students must take tests at monthly ______.
A．distance
B．length
C．periods
D．intervals
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