18. Mai is not strong enough to lift that box.
19. They have worked here since last year.
20. Sue goes shopping in order to buy a new television.
21. His father asked him to turn down the radio for him.
22. Ba always studies well.
23. My father used to smoke ten years ago.
24. How about going to the movie now?
25. My father drives carefully.
26. Lan has studied English for 4 years.
27. The bicycle made in Viet Nam is 50 dollars.
28. Viet Nam is a rice exporting country. (Hình như thế :))
29. Quang said that new books were very expensive.
30. Nhi asked Nga whether/if she knew My Son.
31. The Statue of Liberty was presented to the United States by France in 1876.
Học tốt nhé!