21. Workers are building many new roads in this city. ​​(Passive voice: Chuyển sang câu bị động)

à……………………………………………………………………………………………………………

22. They have changed the date of meeting. ​​(Passive voice: Chuyển sang câu bị động)

à……………………………………………………………………………………………………………

23. I was sick yesterday, so I didn’t go to class. ​

à If ………………………………………………………………………………………………………… 

24. I can’t look the word up because I don’t get a dictionary. 

à If …………………………………………………………………………………………………………

25. Today isn’t Sunday, so I can’t go out with my friends. 

à If …………………………………………………………………………………………………………

26. We didn’t find out about the meeting until he phoned us. 

à It was not until …………………………………………………………………………..………………

27. I didn’t know how to ride a bicycle until I was 15. 

à It was not until  …………………………………………………………………………..………………

28. Tan / be / interest / astronomy.

(Complete the sentence with V-ing/-ed): Hoàn thành câu với động từ đuôi –ing hoặc –ed)

à