$IV.$

$26$. Harmful

$27$. Economical

$28$. Explanation

$29$. Collection

$30$. Attractive

$V.$

$31$. Up

$32$. At

$33$. In

$34$. For

$35$. At

$VI.$

$36$. What an expensive car!

$37$. Hoa rides her bike in the park in her free time.

$38$. Mai was asbent from class yesterday morning because she was ill.

$39$. Did your brother visit Thu Le zoo with his classmate last week?

$40$. I hope you will visit Ho Chi Minh City one day.

XIN HAY NHẤT

IV.

26. harmful: có hại

27. economical: tiết kiệm

28. explainment: lời giải thích

29. collection: bộ sưu tập

30. attractive: hấp dẫn

V.

31. up (look it up): tra cứu

32. bad: bad/ good + at + sth/ V-ing.

33. in: successful + in/ at + sth/ V-ing; in được dùng nhiều hơn)

34. for: buy sth for sb/ buy sb sth

35. with/ in: dissapointed with/ in sb; disapointed at/ about/ by sth; disapointed + at + 1 hành động

VI. 

36. What an expensive car!: dùng a/ an với dt đếm được số ít; bỏ trống nếu đó là dt ko đếm được

37. Hoa rides a bike in the park in her free time.

38. Mai absented from class because she was sick. (absent + from: vắng mặt trong)

39. Did your brother visit Thu Le zoo with his classmates last weekend? (câu hỏi nên đưa trợ V (did) lên đầu)

40. I hope I will visit Ho Chi Minh City one day. (hy vọng cho tương lai (one day) nên dùng will)