1. At 8 p. m tonight, we 

2. All tomorrow afternoon, I 

3. 

4. Don’t phone her now; she 

5. We 

6. What 

7. I know you 

8. 

9. Next time Joe writes to you he 

10. This time next week, I 

1. Can you manage 

2. Teens prefer 

3. You need 

4. They refused 

5. Emailing is popular, but most teens enjoy 

6. He would rather 

7. Where were you last night? I tried 

8. Young children nowadays spend more time 

9. We stopped 

10. It’s difficult 

11. Our English teacher made us 

12. He decided 

13. Many people dislike 

14. I can’t stand 

15. More and more people today are choosing 

1. Can you manage 

2. Teens prefer 

3. You need 

4. They refused 

5. Emailing is popular, but most teens enjoy 

6. He would rather 

7. Where were you last night? I tried 

8. Young children nowadays spend more time 

9. We stopped 

10. It’s difficult 

11. Our English teacher made us 

12. He decided 

13. Many people dislike 

14. I can’t stand 

15. More and more people today are choosing 

a) PTHH: $C{O}_2+Ba{\left(OH\right)}_2\to BaC{O}_3\downarrow +H_{2}O$

b) Ta có: $n_{C{O}_2}=\frac{8,96}{22,4}=0,4=n_{Ba{\left(OH\right)}_2}$

$\Rightarrow C_{M_{Ba{\left(OH\right)}_2}}=\frac{0,4}{0,8}=0,5\left(M\right)$

c) Theo PTHH: $n_{C{O}_2}=n_{BaC{O}_3}=0,4mol$

1.    At the end of the service, a lot of