20.1

3. Glass is made from sand.

4. Stamps are sold in a post office

5. Football is played in most countries

6. This machine isnt used very often

7. What language is spoken in Ethiopia?

8.What is this machine used for?

20.2

3. This room was painted last month

4. These houses were built about 50 years ago

5. Ann's bicycle was stolen last week

6. Three people were injured in the incident

7. When was this church built?

8. When was television invented?

9. How was the window broken?

10. Was anybody injured in the accident?

11. Why was the letter sent to the wrong address?