Supply the correct verb forms

Supply the correct verb forms
1. Please let the boy (sit)......on this chair
2. Empty cans are brought back to the factory for (recycle)
3. We (going/build) a new stadium.........next year
4. Cần we use old cars tires (make) shoes and sandals
5. She was very sad (not/get)....good marks in the exams
6. My sister (enjoy) (eat)......sweets from chocolate
7. The man (sit)...........under thật tree is Nam's uncle
8. You (already/send).........me our photos?
9. I (never/smoke).........before