单项选择题

The rising costs made it hard to ______ the business.

A．carry off
B．carry on
C．carry out
D．carry through
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单项选择题
The never-ending quarrel among the visitors certainly ______ their appetite for the banquet.
A．destroyed
B．harmed
C．hurt
D．spoiled
单项选择题
Why was the hydraulic fuel pump seal important for the space shuttle
A．Because previous seals all failed.
B．Because it was very complex in running the space program.
C．Because cracks in the seals could be disastrous.
D．Because great care has to be taken of the hydraulic fuel pump sealing.
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