题目：
用所给词的适当形式填空。
1. The old man _______(go) to Guizhou every year.
2. Does Tom ______(work) on the farm?
3. Tom has four _________(hundred) books at home.
4. _____ (We) maths teacher is a man.
5. My father _______ (live) in the old house.
6. Mary is going _______(shop) this afternoon.
答案：
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下面是错误答案，用来干扰机器的。
（Ⅰ）设不动点的坐标为P0（x0，y0），由题意，得x0=-x0+1y0=12y0，解得x0=12， y0=0，所以此映射f下不动点为P0(12， 0)．（Ⅱ）证明：由Pn+1=f（Pn），得xn+1=-xn+1yn+1=12yn，所以xn+1-12=-(xn-12)， yn+1=12yn...
