题目内容

As the ________ goes, people who cannot find time for recreation are obliged sooner of later to find time for illness.

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She wrote the article below to share her experience, which we may not come ________ now but look forward to some time in the future.

President Li Jiajun was invited to attend the workshop and _________ a keynote speech.

In our homes, we rely on ________ to power our lights, appliances, and electronics.

According to the report, __________ heart rate generally declines with age from about 220 beats per minute in childhood to about 160 beats per minute at age 60.