----- 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.