问题描述：
Danny_____(认为)he could hit the ball,but he hurt his hand.
空里应填什么,写出,并说明理由.
还有：
I often help my mother _____(clean)the room.
空里应填什么,写出,并说明理由.
还有：
I often help my mother _____(clean)the room.
问题解答：
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