单项选择题

The staff have been informed that under no circumstances()the telephone in the office for personal calls.

A. may they use
B. they use
C. they could use
D. did they use

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单项选择题
Why do scientists put bands on penguins’ flippers()

A. So they can identify the birds from a distance.
B. They want to slow them down as they swim.
C. The bands protect them from being attacked.
单项选择题
When must the first essay be handed in()

A.November 30.
B. September 30.
C. October 30.
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