单项选择题

In order to be registered for our 5-year warranty, please send us the following postage-paid registration form （） 7 days of purchase.

A.by
B.until
C.within
D.before

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The latest （） to emerge from our production lines is considered by many to lead the field in the area of mobile communications.

A.product
B.produce
C.producing
D.productivity
单项选择题
The marketing think-tank believes that the next ten years will see an enormous （） in travel and other leisure-related industries.

A.expand
B.expansive
C.expansion
D.expansively
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