Fill in the blanks with is/am/are:
1. There ……………. no milk in the jug.
2. Boys ………………… hungry.
3. I ………………… waiting for a bus.
4. Chandigarh ……………….. a clean city.
5. She ……………….. angry with me.
6. They ………………… very busy on Monday.
7. I ……………….. trying to solve this problem.
8. My friends ………………… very helpful.