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single source of air pollution

A. point source

B. nonpoint source

C. ozone

D. conservation

We stopped at the petrol station ……..some water.

A. to buy

B. buying

C. to bought

D. to buying

There’s no harm ____ trying.

A. to

B. at

C. in

D. on

He had to wait until the ______ end to bring up the topic.

A. really

B. very

C. both