单项选择题

Only twenty percent of the work () done yesterday.

A. has
B. was
C. have
D. were

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单项选择题
—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job — () my students have a try

A. Shall
B. Must
C. Will
D. May
单项选择题
—Will you be able to finish the job this week —______.
A. I can't say it
B. I don't know that
C. I'm not sure this
D. I don't expect so
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