----- Nội dung dịch tự động từ ảnh -----
Exercise 7. Fill in the blank with the correct prepositions.

1. My sister is __________ the Red Cross.
2. We donate books __________ an orphanage every year.
3. We can exchange dead batteries __________ a plant.
4. Last month, we gave gifts __________ old people.
5. My family grew vegetables __________ a primary school last spring.
6. That policeman is very kind. He is taking care __________ thousands of homeless and cats.
7. I had a gap year, so I volunteered __________ teach art __________ children.
8. Nancy and her friends are picking __________ rubbish __________ the beach now.
9. They turn old plastic bottles __________ hundreds of pretty vases and toys.
10. We spend a day cleaning __________ dirty streets every week.