单项选择题

There's a whole of bills waiting to be paid.

A．stock
B．stack
C．number
D．sequence
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单项选择题
Competitors for the painting competition must ______ their entries by Friday.
A．give
B．offer
C．grant
D．submit
单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A．inclined to
B．subjected to
C．prone to
D．bound to
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