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We should base our theory on facts.

Theory ________ ________ ________ ________ facts.

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Please explain this rule to me.

Please explain ________ ________ ________ ________.

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His carelessness led to the accident.

The accident________ ________ his carelessness.

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He lay in bed, reading a book.

He lay in bed________ ________ a book.

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I find it hard to learn English well in such a short time.

I find________ ________ ________ to learn English well in such a short time.

用适当的介词填空

I thanked the host ________ his kindness.

用适当的介词填空

I’ll try my best to find out the cause ________ the fire.

用适当的介词填空

The famous basketball player’s career came ________ an end when he broke his left arm.

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He determined to find out the cause of the fire.

He ______ ______ ______ ______ to find out the cause of the fire.

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Where to spend our holiday hasn’t been decided yet.

______ ______ ______ ______ ______ ______ hasn’t been decided yet.