1 . She spent years________ (观察) their daily activities. (根据汉语提示单词拼写)
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2 . The three men seemed to have finished l_______ (装载) the truck.
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3 . ______ (后悔) the past or worrying about the future is not the best way to success in one’s life. (根据汉语提示单词拼写)
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