Look! A big modern bridge ________ across the Changjiang River in our city.

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What did people use before paper ________?

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________ the machine ________ for keeping warm?

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My trousers are worn out. Can they ________?

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The eraser ________ in the comer of the room.

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A new bike ________ (buy)for me by my father tomorrow.

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Is this the first time you ________ Macao?

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After that he ________ hard and ________ everything carefully.

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　　－Aren't you going home now?

　　－No. I ________ back until I ________ all the fish.

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Helen ________ a book about China last year, but I don't know whether she has finished it.

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