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.