单项选择题

The traveler brought back some ______ of the rocks from the mountains.

A．samples
B．specimens
C．selections
D．examples
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单项选择题
We are looking forward to ______ to the lecture by the famous professor.
A．send
B．be sent
C．being sent
D．sending
单项选择题
Mother insisted that ______.
A．they are to be back before nine in the evening
B．they ought to be back before nine in the evening
C．they be back before nine in the evening
D．they had to be back before nine in the evening
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