作用力与反作用力大小相等,方向相反,作用在一条直线上.作用力与反作用力的性质必定
Many other new techniques are now available that enable more research(do) in the test tube to see if chemicals produce harmful biological effects.
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He took his umbrella with him lest it(rain).
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Every boy and girl(treat) in the same way.
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Robots,(become) increasingly prevalent in factories and industrial plants throughout the developed world, are programmed and engineered to perform industrial tasks without human intervention.
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One hundred miles(be) too far to travel on foot.
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I would rather you(come) tomorrow.
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Although they agree that life is important and should be respected, they feel that the quality of life should not(ignore).
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If you had been in better health, we(allow) you to join them in the work.
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The theory of black holes in space(accept) by many serious scientists and astronomers.
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Do not let this(say) of you. It shows an unattractive indifference to your employer and to your job.