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____: n. sth. that tests strength, skill, or ability 挑战

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____: (used to make a suggestion about what to do) 怎么样

____: v. give private lessons to (sb.) 任家庭教师教(某人),辅导

____: become dominant 变成主要的,取而代之

____: (infml) make an appearance; arrive 露面,出现