Which of the following sentences is NOT true, according to the passage?

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The teacher ______ me that I had to prepare for the examination carefully.

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The Smiths usually go out for dinner_______ Sundays.

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For Vietnamese people, Tet or Lunar New Year holiday is the most important _______.

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If you don't work harder, you _______ successful.

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If Mary _____ here now, she would help me to solve this problem.  

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I think this test is_______ than the one we did last month.

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Jack found an old coin while he _______.