单项选择题

Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.

A．sinking behind
B．falling behind
C．drawing behind
D．crawling behind
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单项选择题
Nowadays, books are expensive. Every time I go to the bookstore, I seem ______ more.
A．to be spending
B．spending
C．to spending
D．spend
单项选择题
It is unusual for there ______ so many tourists on the beach at this time of the year.
A．be
B．were
C．being
D．to be
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