单项选择题

The European Union countries were once worried that they would not have supplies of petroleum（）

A. pure
B. efficient
C. potential
D. sufficient

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单项选择题

Tom placed the bank notes, （） the change and receipts, back in the drawer.

A. more than
B. but for
C. thanks to
D. along with

单项选择题

My mother is a light sleeper, ______ to any sound even as low as the humming of a mosquito

A. alert
B. acute
C. keen
D. immune

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