Itisdifficultforanyofustoeatbe

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It is difficult for any of us to eat better, exercise more, and sleep enough, ________we know
we should.

A．because	B．even if
C．unless	D．before

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108. Dr. Manette had been mentally ____ by his long years alone in prison and his hair had turned white.

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105. The waters of this great lake, which is also the world's deepest, have been ____ by waste from a chemical factory.

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