21: I understand you ______(have) an unpleasant experience at the weekend. What exactly______(happen)?

22: "Good night. It______(be) nice to meet you," he______(say) and ______(go) off to his car.

23: I will graduate in June. I will see you in July. By the time I______(see) you, I______(graduate).

24: We______(already finish) that work by the time you get back.

25: When I arrived at the meeting, the first speaker just______(finish)

speaking and the audience were clapping.

26: The traffic was very heavy. By the time I______(get) to Mary's party, everyone______(already arrive).

27: "You______(find) the key which you______(lose) yesterday?" "Yes. I______(find) it in the pocket of my other coat."

28: Tomorrow I'm going to leave for home. When I______(arrive) at the airport, Mary______(wait) for me.

29: Sarah has lost passport again. It is the second time this______(happen).

30: When the alarm rang, Jack______(jump) out of bed quickly.

31: It's no use getting impatient. The plane______(not arrive) until the weather______(clear) up.

32: John and I______(study) at the same school and we______(be) great friends ever since.

33: Don't wait up for me. I can't tell when I______(be) back.

34: Here you are! What you______(do) here at this time of night?

35: Good-bye, Ned. I never______(forget) you. I______(miss) you more than anyone I ever______(know) in my life.

36: The secretary______ (type) all the documents long before the manager comes.

37: You see, I______(do) this kind of thing for the last 30 years.

38: When we______(get) to the restaurant, we______(find) that nobody ______(remember) to reserve a table.

39: I could tell at a glance that the pile of letters on my desk______(disturb) while I______(be) out.

40: As soon as she arrived England, she______(find) that the language ______(be) quite different from the English that she______(learn) at

Bài 10. Cho 10,8 gam hỗn hợp gồm Mg và Al vào dung dịch axit clohiđric (HCl) dư. Tính thể tích khí H₂ sinh ra ở đktc. Biết rằng các phản ứng xảy ra hoàn toàn.

Bài 8. Cho 11,2 gam sắt vào dung dịch chứa 18,25 gam axit clohidric(HCl), sau phản ứng thu được sắt(II) clorua(FeCl₂) và khí hidro(H₂).

a. Viết PTHH xảy ra

b. Tính thể tích khí H₂ thu được ở đktc.

c. Nếu H% =60% thì thể tích H₂ thu được thực tế là bao nhiêu

Câu 18: Khử hoàn toàn 40,5g oxit của một kim loại hoá trị II bằng khí CO nung nóng thu được 32,5g kim loại. Xác định công thức của oxit kim loại và tính thể tích CO₂ thu được sau phản ứng ở đktc.

Bài 18: cho 4,928 lit khí H₂ (đktc) đi qua 20 gam CuO nung nóng, sau 1 thời gian người ta thu được 12g Cu . Tính hiệu suất khử CuO ?

III. Change thesse sentences into pasive:

1.Somebody cleans that room every day. => ……………………………………………….………………

2. They cancelled all flights because of fog. => ..………………………………………….………………

3.They are building a new highway around the city. => ………………………………………….…………

4.They have built a new hospital near the airport. => …………………………………………….………………

5. They will ask you a lot of questions at the interview. => ……………………………………………….………

6. People don’t use this road very often. => …………………………………………….…………………………

7. Somebody accused me of stealing money. => …………………………………………….…………………….

8. Somebody is using the computer at the moment. => …………………………………………….……………..

9. The bill includes service. => …………………………………………….………………………………………

10. They have changed the date of the meeting. => …………………………………………….…………………