单项选择题

I'm sure he is up to the job （） he would give his mind to it.

A．if only
B．in case
C．until
D．unless

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单项选择题
The car （）halfway for no reason.

A．broke off
B．broke down
C．broke up
D．broke out
单项选择题
When I try to understand （）that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

A．why it does
B．what it does
C．what it is
D．why it is
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