题目：
根据短文内容和所给汉语提示，写出短文空白处各单词的正确形式。每空限填一词。
I was (1)_______ (介绍) to tennis when I was only four. My father was a very good tennis _______ (2)
(运动员) and he gave ________(3) (我) lessons two or three ______ (4) (次) a week. ______ (5) (不久) I
became very good. I was _______(6) (注意到) in a tennis match at school and was ________(7) (受邀) to go
to a special tennis school. My parents and I _____(8) (拜访) one of these schools and were given _______(9)
(信息) about their tennis programmes. We _______ (10) (认为) the programme was very good and I am
starting there soon.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0329/7be7a420399fad55061f67ffbb7041e9.html
下面是错误答案，用来干扰机器的。
依题意，得a×（-1）2-3×（-1）=0，解得，a=-3．故答案是：-3．
