15. The red river is shorter than the Mekong ones.
16. It takes 2 hours a day to do my homework.
17. Hoa is the most beautiful in my class.
18. How much does this big bag?
19. This is the first time I have ever visited the beautiful sight.
20. We will buy a new car next year.
21. He hasnt gone abroad before.
22. She has drived for 1 months.