Part 9.
1. There is a school near the post office in my town
2. While I was writing the letter, the phone rang
3. I was very pleased to see Tom again after a long time
4. Thuy has left her school since 2000
5. She goes to work for about 20 minutes
6. How much does that backpack cost
7. There are over two hundred stamps in my collection
8. This pocket-watch is more expensive than that wristwatch
