单项选择题

It is vital that food and shelter are made for people in the flood-stricken are（）.

A．free
B．useful
C．available
D．usable

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单项选择题
Mrs. Douglas unknowingly left a package（）on the shop counter.

A．laying
B．to lie
C．laid
D．lying
单项选择题
Earthworms occur（） adequate moisture and food and the necessary soil conditions are found.

A．and
B．whenever
C．however
D．wherever
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