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I sent a letter to Bob ________ his mother．

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We are not familiar ________ the paintings painted by Picasso．

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You must concentrate ________ what the teacher tells you．

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He came up ________ a good plan, and we all agreed to take it．

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The price for salt is going ________ these days．Let’s buy some in case the price is raised．

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Our club consists mostly ________ workers．

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Yang Liwei is known ________ his first travel to travel space．

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Professor Li isn’t in the office ________ the moment．

句型转换

Before liberation, the labouring people had no rights to enjoy education．

Before liberation, the labouring people ________　________　________　________ education．

句型转换

A good idea was put forward at the meeting．

A good idea ________　________ at the meeting．