单项选择题

His parents are worried because they haven't heard of their son in more than two months.

A．worried
B．because
C．of
D．in
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单项选择题
If the experiment succeeds or fails, it will provide us with valuable experience, which is essential to improving our future work.
A．If
B．provide us with
C．valuable
D．improving
单项选择题
Because of the severe snow storm and the road blocks, the air force dropped food and medical supplies close the city.
A．Because of
B．the
C．dropped food
D．close the city
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