题目内容
Tom takes _________ exercise, and he goes to the gym three times a week.
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We all look forward to the day when the scientists can _________ more secrets of the universe.
If you can't ________ a new copy, perhaps you can find a second-hand copy.
Most people didn’t ________ the harmful effect of smoking until they get lung cancer.
Tom held a big party to _________ his 24th birthday two days ago.
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