用向量证明：若平面内的一条直线垂直于平面外的一条直线在该平面上的投影，则这两条直线垂直．
China is seeing ______ growing trend in the number of people owning pets and ______ recent survey finds that one in 13 Chinese now keep animals.
已知圆锥侧面积为10πcm2，侧面展开图的圆心角为36º，圆锥的母线长为（ ）
John： What do you do on Sundays？
Tom： I read books and watch TV. What do you do on Sundays？
John： I do my homework . What about you, Mary？
Mary： I clean my room and watch TV.
John： You're helpful.
根据提示补写名句或填写课文原句
