Newtechnologytomakesurethatthe

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New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.

A．is used; not to pollute	B．has used; is not polluted
C．is being used; do not pollute	D．has been used; to pollute

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He would rather ______ his parents with their housework than _____ out to play games.

A．to help, to go

B．help, go

C．help, to go

D．to help, go

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_____ carelessly, the boy made mistakes here and there. .

A．being written

B．Wrote

C．Write

D．Writing

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The problem requires ______.

A．studying with great care	B．to study carefully
C．to be studied without carelessness	D．taking great care of studying it

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_____, she burst into tears.

A．Deeply moved	B．Deeply moving
C．As she deeply moved	D．As she was deeply moving

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I couldn't help _____ when I heard the joke.

A．being laughed

B．laughing

C．to be laughing

D．to laugh

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