单项选择题

After ______ seemed an endless night, it was time for them to open the boxes of presents.

A. it
B. that
C. what
D. there
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To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world-market demand.
A. improve
B. enhance
C. guarantee
D. gear
单项选择题
The pollution question as well as several other issues is going to be discussed when the Congress is in ______again next spring.
A. assembly
B. session
C. conference
D. convention
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