填空题

A large sum of money must be spent on Lyubomirsky’s research because it needs to trace a lot of people ______.

【参考答案】

over a long time
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The example of keeping a daily gratitude journal shows that ______ is very important.
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Because little research had been done on the explanation of happiness, before going into the lab, Lyubomirsky had done some ______.
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