English example sentences with "act up"

You had better act upon his advice.
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Cause and effect react upon each other.
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I haven't known the fact up to now.
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I only wish I had the courage to act upon my impulses.
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Tom's manager ensured him that his duty to his country was to be kept secret, but that it had no impact upon the security of the nation.
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Please don't act up this time. Just let the doctor examine you in peace.
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When you see something, your visual system absorbs light—photons—and your brain processes the view into something you can understand and, perhaps, act upon.
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Don't act up.
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Ziri had to keep his act up.
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Ziri's knees started to act up.
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The 2d law of chemical attraction is, that it takes place only between the most minute particles of bodies; therefore, the more you divide the particles of the bodies to be combined, the more readily they act upon each other.
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My allergies act up during hay fever season.
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Children may act up in class in an effort to get attention.
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He started to act up, but she sat on him.
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