问题: 填空，填空，速度，速度！！！！！！！！！！很急的！！！！！
他昨天滑雪的时候摔倒了，伤了膝盖
He_______ _______ when _____ yesterday and hurt his knees
对大多数人来说，篮球是一项很容易参与的运动
For most people, basketball is a game _______ ______ _______ ______ take part in.
解答:
He lay down when skating yesterday and hurt his knees .
For most people, basketball is a game that is easy to take part in.
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