Dùng từ gợi ý viết thành câu hoàn chỉnh:
1. How much does it cost to mail to letter from USA?
2. Do yo want to post this letter for your friend?
3. Why do you want to buy a phone card?
Do/ want/ post/ letter/ your friend?
do you want to post the letter to your friend?
4. How/ it/ cost/ post/ local letter/ Viet nam?
how much does it cost to post a local letter in Vietnam?
5. Why/ you/ buy/ phone card?
why did you buy a phone card?