单项选择题

It is essential that these application ______ forms back as early as possible.

A. must be sent



B. will be sent
C. are sent



D. be sent
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单项选择题
Dr. Smith was always ______ the poor and the sick, often providing them with free medical care.
A. reminded of


B. absorbed in
C. tended by


D. concerned about
单项选择题
—You'd better ______ work too hard like this. —I see. You mean ______ too hard makes one tired and ill.
A. not ; work



B. don't ; working
C. don't; to work


D. not; working
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