_____is known to us all is that we shoulddo as much as we can ______ stop the pollution of the environment.

Sit down, please. — .

下列各句中与例句句式相同的一项是例：非夫人之为恸而谁为

QingdIthink I’ll go there for _______ third time.

Why not try your luck downtown,Bob?That’s _______ the best jobs are.