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【简答题】
He quickly came __1__ her aid. He is tired __2_ the rain. He felt ashamed that he had let his wife get him _3__ a fight. It would be a nice gesture __4_ her part not to start _5__ that conversation. He was angry with her for resorting __6__ this trick. He took her hand and dabbed __7__ her thumb ___8 __ the cotton., You can count ___9__ me. I wouldn't have embarass you __10__ anything.
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【简答题】如图，在圆 上任取一点P，过点P作 轴的垂线PD，D为垂足，当点P在圆上运动时，求线段PD的中点 的轨迹方程.
【简答题】如图，ABCD是正方形，过点D作PD⊥平面ABCD，连接PA、PB、PC，若PD=DC，E是PC的中点，连接DE，过E作EF⊥PB于F． （1）求证：PA ∥ 平面EDB； （2）求证：PB⊥平面EFD．
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【简答题】在图中，求作一点P，使P到∠AOB的两边的距离相等，且PC=PD．