itcomestotheincreasinguseofmot

________ it comes to the increasing use of motor vehicles in the cities，some people think it should be limited．

A．Because

B．Once

C．When

D．While

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If you _____ smoke, please go outside because this is a non-smoking office.

A．must

B．should

C．can

D．may

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––All of them.

A．will have attended

B．have attended

C．attended

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In that school, English is compulsory for all students, but French and Russia are ____ .

A．special

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––I had meant _____, but something unexpected happened.

A．so

B．that

C．not

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We should discuss the plan _____ before we work it out.

A．in general

B．in detail

C．on time

D．on purpose

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