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To work in a school is very interesting．

________　________ very interesting to work in a school．

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Cai Lun invented paper．

Paper ________　________　________ Cai Lun．

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I prefer oranges to apples．

I ________　________ oranges ________　________ apples．

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The telephone was invented before the car．

The car was invented ________　________　________．

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This boy is not old enough to go to school．

This boy is ________　________ to go to school．

This boy is ________　________　________ he can’t go to school．

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The problem with this system is that poorer people don’t have the money to pay for private health insurance．

The problem with this system is that poorer people don’t have the money ________　________ private health insurance．

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They often have both health and money problems．

They often have ________　________ health problems ________　________ money problems．

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The health insurance company pays the doctors and the hospitals．

The doctors and the hospitals ________　________ by the health insurance company．

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They see doctors who work for themselves and pay the doctors through the health insurance company．

They see doctors ________　________ themselves and pay the doctors through the health insurance company．

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Britain was the first country in the world to have a free health care system paid for by the government．

Britain was the first country in the world to have a free health care system ________　________　________ for by the government．