用所给词的适当形式填空。

1. Tom is a good _____ (wait). He is very careful and kind.

2. I know you _____ (teach) history for 20 years.

3. Could you tell me how _____ (get) to the railway station?

4. Mr. Wang has worked as a engineer. He is _____ (experience).

5. Lily and Lucy _____ (live) in Beijing since they were 3 years old.

6. It will take me some time _____ (save) enough money.

7. She _____ never _____ (see) that film before.

8. I'm sorry _____ (bring) you so much trouble.

9. I _____ (lend) her some story books the day before yesterday. 

    but she _____(not give) them back to me yet.

10. —_____ you ever _____ (be) to the Palace Museum?

      —Yes. I _____ (go) there two years ago.

下列关于栈的叙述中正确的是( )。

A．在栈中只能插入数据

B．在栈中只能删除数据

C．栈是先进先出的线性表

D．栈是先进后出的线性表