No one can ________ the wheel of history however powerful he may be .

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Was it in the corner of the classroom ________ you found my lost watch?

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The man has been standing in front of the museum for a long time . He ________ for somebody.

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This year the farmers have produced ________ grain ________ they did last year.

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In the past ten years many buildings and bridges ________ in Beijing.

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It's time Tom ________ the problem .

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Our advantage of advertising is that it helps ________.

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A．make a product expensive

B．reduce the costs of a product

C．increase product sales

D．increase production

Balloons and light aeroplanes can be used to pull huge signs as they fly slowly ________ a city.

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