根据句子意思及所给的首字母或汉语提示，写出该句子中所缺的单词。

1. Li Na is a famous tennis p______.                              

2. We can't l______ to music when the teacher is talking in class.

3. The children had a______  been asleep when I got home .        

4. Mr Li is s______ with his students and makes them work hard.   

5. Zhou Gu was ______ (采访) by the local  newspaper.             

6. There are ______ (五十二) weeks in a year.                       

7. The doctor gave him some medicine for his serious ______ (疾病).

夏天，人们常常会在河边看到“蜻蜓点水”的现象．你知道哪些蜻蜓在进行什么活动（　　）

A．喝水

B．产卵

C．练习飞行

D．捉河里的小动物