单项选择题

The students must hand in their essays in a week, ______ No, they ______.

A. needn't they... mustn't
B. mustn't they... mustn't
C. mustn't they... needn't
D. shouldn't they... should
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In spite of the ______ economic forecast, manufacturing output has risen slightly.
A. gloomy
B. dizzy
C. opaque
D. faint
单项选择题
Doctors are interested in using lasers as a surgical tool in operations on people who are ______ to heart attack.
A. prone
B. disposed
C. infectious
D. accessible
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