根据句意及汉语提示完成句子。

1. Reading Harry Potter has become very popular _____ (在……之中) many students.    

2. —How long may I _____ (借) the book?        

    —For a week.  

3. Which is _____  (安全), traveling by train or by plane?    

4. On my _____  (二十) birthday,I received lots of presents from my friends.    

5. Computer is one of the greatest _____ (发明). I can't imagine life without it.    

6. Can you_____  (买得起) to buy the house? It's quite expensive.    

7. I was too busy and _____  (错过) the film“Transormers 2".    

8. They are different. They do things _____  (不同),  too.    

9. Parents should not be too _____ (严厉的) with their children.    

10. She wants to _____ (成为)  a singer when she grows up.

试结合中外史实，论述古代教育的阶级性是如何体现的。