单项选择题

Everyone here will thank the fire-workers for the things they have done to prevent fire（） the environment safer.

A. making
B. from making
C. to make
D. made

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单项选择题

—Would you like to come to dinner tonight —I'd like to, （）I'm too busy.

A. and
B. so
C. as
D. but

单项选择题

My handkerchief must be（）but I can't find it.

A. anywhere
B. where
C. somewhere
D. nowhere

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