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

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