21. Generally speaking, when taken according to the _________, the drug has no side effect.
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A. directions
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B. instructors
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C. introductions
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D. explanations
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22. When asked by the police, he said that he remembered ________ at the party, but not ________.
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A. to arrive; leaving
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B. to arrive; to leave
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C. arriving; leaving
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D. arriving; to leave
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