"You can't have this football back —— you promise not to kick it at my cat again," the old man said firmly.
A. because
B. since
C. when
D. until
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_____ environmental damage is done, it takes many years for the ecosystem (生态系统) to recover.
A. Even if
B. If only
C. While
D. Once
We’re just trying to teach a point ____ both sides will sit down together and talk.
A. where
B. that
C. when
D. which
His plan was such a good one _________we all agreed to accept it.
A. so
B. and
C. that
D. as
This is a very interesting book. I’ll buy it, _______.
A. how much may it cost
B. no matter how it may cost
C. however much it may cost
D. how may it cost