14. you ought to wash and iron her own clothes.
15. I should read those books.
16. Lan was the most intelligent girl in her class.
17. their friends would get the award for the highest scores.
18. he would go to school the next day.
19. they would travel around the world by plane.
20. he needed to learn more vocabulary.
21. she had to do more grammar exercises.
22. Lien might go shopping with her friends.
@HOCTOT
