26. C. was (Danh từ số ít (the first supermarket))

Years + ago -> QKD

27. B. Be different from 

28. A. Customers 

29. B. For example

30. A. Who (dùng khi N chỉ người, đóng vai trò chủ ngữ

31. They have just sold that old house.

-> The old house has just been sold.

Bị động của HTHT: have/has + been + V3/ed 

32. In spite of the bad weather, they had a wonderful day.

-> Although the weather was bad, they had a wonderful holiday. 

CT: In spite of + N / V_ing = Despite + N / V_ing = Although + S + V 

33. They will build a new mall here.

-> A new mall will be build here.

Bị động của TLD: will + be + V3/ed

34. Unless he takes these pills, he won't be better. 

-> If he doesn't take these pills, he won't be better.

Unless = If + S + not.....

35. Despite working hard, he can't support his family. 

-> Although he is working hard, he can't support his family. 

36. If/it/ not rain/ tomorrow/ I go/ camping/ my friends

-> If it doesn't rain tomorrow, I will go camping with my friends. 

If 1: If + S + V(s,es)..., S + will/can...+ V

37. If/ I/ meet/ alien/ outer space/ I/ invite/ home/ talk. 

-> If I met an alien from outer space, I would invite him to my home to talk. 

If 2: If + S + V2/ed..., S + would/could... + V

38. I/ never/ travelled/ by/ air.

-> I have never travelled by air.

to have never + V2/ed

39. The students/ study/ for exam/ now.

-> The stundents are studying for their exam now.

Dấu hiệu nhận biết: now -> HTTD

40. It/ be/study/ cold day/ we/ decide/ not/ go out.

-> It was such a cold day that we decided not to go out. 

It + to be + such + a/an + N + that....