bài 1
1. Have you ever done volunteer work?
2. Do you want to become a volunteer?
3.We raise fund for homeless children in Hanoi.
4. Do you think how we help elderly children?
5. We provide education for disabled children.
bài 2
1. I have never seen him before
2. I have studied English for 3 years.
3.I last saw him was I lest school.
4.I has rained for 2 day