1B

2 C

3 B

4 C

5 D

III

1 A

2 D

3 C

4 C

5 C

6 B

7 A

8 B

9 D

10 A

11 C

12 C

13 B

14 C

15 D

16 C

17 C

18 A

19 D

20 B

21 D

22 D

23 A

24 A

1. There's the lady whose dog was killed.

2. That's the man who is going to buy the company.

3. He's the person whose car was stolen.

4. She's the new doctor who is coming to the hospital next week.

5. She's the journalist whose article was on the front page of The Times.

6. They're the people whose shop burned down last week.

7. That's the boy who has just got a place at university.

The next picture:

1. This is the man whom I met in Paris.

2. I wanted the painting that you bought.

3. This is the chair that my parents gave to me.

4. She is the woman who telephoned the police.

5. He's the person who wanted to buy your house.

6. We threw out the computer which never worked properly.

7. This is the lion who has been ill recently.

8. The man who was driving the car was badly injured.

9. The children who live in the next street broke the window. 

10. That's the woman whom I was telling you about.

PTHH: \(Na+H_2O\rightarrow NaOH+\dfrac{1}{2}H_2\uparrow\)  (1)

            \(Al+NaOH+H_2O\rightarrow NaAlO_2+\dfrac{3}{2}H_2\uparrow\)  (2)

Ta có: \(n_{H_2\left(1\right)}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

\(\Rightarrow n_{Na}=0,8mol\) \(\Rightarrow m_{Na}=0,8\cdot23=18,4\left(g\right)\)

Mặt khác: \(n_{H_2\left(2\right)}=\dfrac{15,68}{22,4}=0,7\left(mol\right)\)

\(\Rightarrow n_{Al}=\left(0,7-0,4\right)\cdot\dfrac{2}{3}=0,2\left(mol\right)\) 

(Vì Na là kim loại rất mạnh nên cũng sẽ tác dụng với nước trong dd NaOH dư và giải phóng khí H₂ nên phải trừ số mol của H₂ của Na)

\(\Rightarrow m_{Al}=0,2\cdot27=5,4\left(g\right)\)

\(\Rightarrow m=5,4+18,4=23,8\left(g\right)\)

đâu ?

I 1D 2C 3B 4A 5D 6B 7D 8A 9C 10C

III 1D 2C 3A 4B 5A 6C 7B 8B 9C 10C 11A 12B 13C 14A 15A 16B 17A 18D 19B 20C 21C

1 He told me he had something to show me then

2 She said se was leaving there for Hue the next day

3 Tom told her he would come with her as soon as he was ready

4 The father told us he had to go then

5 she asked me why I came there late

6 peter asked me who put the salt in his cup of coffee

7 He asked the girl if she could play the piano

8 Maryam said that she was having a good time there

9 Hoa asked Maryam is she liked pop music

10 The man asked the boy where he lived

VII

1 had bought

2 was

3 had sold

4 passed

5 could

6 would sell

7 had gone

8 hadn't done

9 was listening

10 had to

VIII

1know   2what   3subjects  4written  5many   6in   7understanding   8friendship

IX

It's high time we went home

Unless you have a jacket and tie, you can't go to this restaurant

It was such a difficult question that no one could answer it

This letter hasn't been finished yet

5 Because he isn't good at English, he can't get a job