题目：
请根据句意用所给单词的适当形式填空。
小题1:The teacher devoted his lifetime to (teach) his students.
小题2:While (watch) the programme, the children felt excited.
小题3:When we got to the cinema, the film (begin).
小题4:When I was young, my teacher told me that the earth (go) around the sun.
小题5:Titanic is a romantic film (direct) by James Cameron
答案：
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下面是错误答案，用来干扰机器的。
证：曲线C1的直角坐标方程x-y=4，曲线C2的直角坐标方程是抛物线y2=4x，（4分）设A（x1，y1），B（x2，y2），将这两个方程联立，消去x，得y2-4y-16=0⇒y1y2=-16，y1+y2=4，（6分）∴x1x2+y1y2=（y1+4）（y2+4）+y1...
