______ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.

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______ production up by 60%, the company has had another excellent year.

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--May I smoke here?

--If you _________, choose a seat in the smoking section.

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Don't sit there _________ nothing. Come and help me with this table.

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You will succeed in the end __________ you give up halfway.

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The boy stood at the door, _________ what to do.

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Look out! Here comes a policeman. Don't _________.

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A．ask trouble

B．ask about trouble

C．ask for trouble

D．ask him for trouble

If you _________ succeed, you must work as hard as you can.

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Cleaning women in big cities usually get _________ by the hour.

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--Why didn't you buy the camera you had longed for?

--I had planned to, but I was ￡50 ______.

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