单项选择题

Many people believe we are heading for an environmental disaster(灾难) （）we radically(根本地) change the way we live.

A．but
B．though
C．unless
D．in case

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单项选择题
It's good that we （）to the park because it's started to rain.

A．don' t go
B．hadn' t gone
C．didn' t go
D．wasn' t going
单项选择题
All the girls swam in the lake except two, who（）halfway.

A．gave off
B．gave up
C．gave away
D．gave out
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