17. Ba is the best student in our class.

14. Ba is more interlligent than Nam.

13. Tge Mekong river

13. The Mekong river is longer than Then Red river.

1,Have you sent the letter yet?
2, Nile is the longest river in the worth.
3, Hoa salaries higher than Toms.
13, The Mekong River is longer than The Red River.
14,Ba is more interlligent than Nam.
15, Sears tower is shorter than PETRONAS Twin Tower.

4, He worked hard in order to pass the exam.
5, Early this morning children have decided to go
6, Sydney opera was completed in 1973
7. The road which joins two vilages is narrow
9,.It is not difficult to translate this sentence from english

9,It is not difficult to translate this sentence into english (CORRECT)
10,Wound you mind lending me dictionary?
11,New xe dap which was made in japan is expensive .