1. Many tourists would like to visit Sapa because of its fresh air.
2. ​HCM City is the biggest of the three places.
3. There aren't any deserts in our country.
4. Vinh is the tallest person in our class.
5. Viet Nam has a lot of beautiful lakes.

1.there are lots of beautiful lakes in Viet Nam

=> Viet Nam has a lot of beautiful lakes.

2.Many tourists want to visit Sa Pa because of its fresh air

=> Many tourists would like to visit Sapa because of its fresh air.

3.Da Nang is smaller than Ha Noi , and Ha Noi is smaller than HCM City

=> HCM City is the biggest of the three places.

4.Our country doesn't have any deserts

=> There aren't any deserts in our country.

5. No one is our class in taller than Vinh

=> Vinh is the tallest person in our class.