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It’s difficult (A) to find (B) others workers who are (C) willing to work (D) such long hours.

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She has just bought ____.

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The discovery was a major _______ for research workers.

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Each (A) of the nurses (B) report to the operating room when his or (C) her name is (D) called.

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My father used to (A) give me a (B) good advice (C) whenever I had a (D) problem.

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Who was the last one ______the classroom yesterday?

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By 1820, there were over sixty steamboats on the Mississippi river, _______ were quite luxurious.

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The bad weather caused serious damage to the crop. If only it _______ warmer.