单项选择题

Hawks serve an important purpose in the scheme of nature ______ on destructive rodents, such as mice and rats.

A．by preying
B．in order that preying
C．that they prey
D．than to prey

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单项选择题

I'll come ______ John is invited, too.

A．on condition that
B．in condition that
C．in the circumstances that
D．in case that

单项选择题

I won't pay $20 for the cost; it's not worth ______.

A．ail that much
B．that much all
C．that all much
D．much all that

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