=>
1. Viet Nam has lots of/many beautiful lakes.
-> have/has : có
2. Many tourists want to visit Sapa because its air is fresh.
-> because S V ~ because of N/Ving : bởi vì
3. Ho Chi Minh City is the largest of the three cities.
->  so sánh nhất the adj-est
4. There aren't any deserts in our country.
-> there are (not) + N đếm được số nhiều
5. Vinh is the tallest (student) in our class.
-> so sánh nhất the adj-est
6. Reading books is not as interesting as watching TV.
-> so sánh bằng as adj as
7. My home village is located near the foot of a mountain.
-> be located : nằm ở
8. Nam is Mr. Hung's student.
-> teacher : giáo viên/student : học sinh
9. You must do your homework./You must remember to do your homework.
-> must V : phải làm gì
10. Minh sits behind Quang.
-> behind : sau, ở đằng sau
11. Ho Chi Minh is the biggest city in Viet Nam.
-> so sánh nhất the adj-est