[单选题] The successful completion of the assignment is the result of the cooperation of the whole class. ( )

1、[单选题]Hardly had they arrived at the airport ___the plane started to leave.（）

• A、than
• B、then
• C、until
• D、when

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2、[单选题]______your step,or you might fall into the water.（）

• A、See
• B、Watch
• C、Miss
• D、Look at

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3、[单选题]--Jane wasn’t in when Jack came,was she?
--_______,but she returned a few minutes later.（）

• A、No,she was
• B、No,she wasn’t
• C、yes.She was
• D、Yes,she wasn’t

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4、[单选题]This year the factory _________ almost twice as many motors as it did last year.

• A、tur ned dow n
• B、tur ned off
• C、tur ned out
• D、tur ned over

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5、[单选题]If motorists had to pay an extra tax to drive in cities,they their cars a lot less.

• A、use
• B、will use
• C、used
• D、would use

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