21. They were taken away by a spaceship from another planet
22. If I knew the answer, I would tell you
23. People in the North do not work as hard as people in the South
24. The date of the meeting will be changed again
25. If it doesn't rain, there will be a shortage of water
26. This house was built last year
27. Your kitchen is bigger than mine
IV. Chọn đáp án đúng để hoàn thành câu
28. walk
29. mình k thấy được vế sau :(
30. were
31. friendly
32. official
33. completely
