把下面几个单词连成一句话。

在等式4×□﹣2×□=30的两个方格中分别填入一个数，使这两个数互为相反数，且等式成立，则第一个方格内的数是____ ．

A: Morning, Tom. You don't look well. ____?

B: Well, I have got a cold. But it's not serious. Hey, Jack, did you see the movie on CCTV 6 last night?

A: No, I didn't. ____?

B: Harry Potter Ⅲ. It was so exciting. So, what were you doing at that time?

A: ____. I'm not good at English, you know.

B: But English is not very hard to learn. ____.

A: Thank you for your advice. ____?

B: It's nearly 7:50. Hurry up, or we'll be late fir school.

某电视台体育直播节目从接到的5000条短信（每人只许发一条短信）中，抽取10名“幸运观众”．小明给此直播节目发了一条短信，他成为“幸运观众”的概率是（    ）