There is ____ box in the room. _____ box is heavy.
a # the
举一反三
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They ___________________at the heavy box, but cannot lift it.
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The box is too heavy for the boy to carry.
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__________, he could not move the heavy box alone.
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—This box is too heavy for me to carry upstairs. —________.
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The box was very heavy, but Tom still ________ to carry it home.