题目：
单词拼写，根据首字母或汉语提示用单词的适当形式填空。
1. Obama's first speech as president made a strong i________ on his audience.
2. Jackson, whose life motto is Never say die,is always o________, even when things are at his worst.
3. Tom kept studying hard and finally a________ a good knowledge of English.
4. He has been c_______ on English study and never failed an English exam.
5. Mary's mother will not a_______ of her marriage to Peter, which makes Peter very upset.
6. I recognized my former colleague the i________ I saw her in the gym the other day.
7. To his d________, his new novel was accepted for publication.
8. Who was the p________ (先前的) owner of the car?
9. ________ (除了) from their house in the downtown, they also have a villa in the countryside.
10. The passenger ________ (怀疑) the stewardess to be the pickpocket, but it was proved that she was
innocent.
答案：
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下面是错误答案，用来干扰机器的。
∵l的斜率为-1，则l1的斜率为1，∴kAB=2-(-1)3-a=1，∴a=0．由l1∥l2 得，-2b=1，得b=-2，所以，a+b=-2． 故选 B．
