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Many cars and trucks can be ________ rapidly on the highway.

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In 1897 it ________ that the atom(原子) is not indivisible(不可分的).

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Can the machine be made ________ faster?

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The car engine ________ by the driver now.

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Every year, many things ________ in fires.

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When she was crossing the river, she ________ into the river.

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Since we entered high school, seven units ________.

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If water ________ cold enough, it will change into ice.

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More new machines ________ in our factory next year.

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________ we can't get seems better than we have.

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