25A 26B 27B 28D 29A 30B 31C 32C 33D 34B 35C 36A 37B 38B 39C 40B

1. I can't help you because I am very busy now.

2. He stayed at home last Friday as it rained heavily.

3. Since it is very hot, we turn on all the fans.

4. The students learn English very badly because it is very difficult.

5. As Miss Dung is very kind, many people like her.

6. We can do the excercises quickly since they are very easy.

7. Because they didn't review the lessons carefully, they didn't do the test wel..

8. As they are in a hurry, they can wait for you.

9. Nam didn't go to school on time since he got up late.

10. Because her clothes are old, she has to buy some new ones.

11. As your shoes are very dirty, you should put them in the corner of the room. 

12. We went to the seaside for the weekend since the air in the city was not fresh.

13. These pupils often get bad marks because they are very lazy.

14. As the play was very long, we went home before the end.

1. I can't help you because/since/as I am very busy now

2. He stayed at home last Friday because/since/as it rained heavily

3. We turn on all the fans because/since/as it is very hot

4. The students learn English badly because/since/as it is very difficult

5. Many people like Miss Duong because/since/as she is very kind

6. We can do the exercises quickly because/since/as they are very easy

7. They didn't do the test well because/since/as they didn't review the lessons carefully

8. They can't wait for you because/since/as they are in a hurry

9. Nam didn't go to school on time because/since/as he got up late

10. She has to buy some new clothes because/since/as her ones are old

11. You should put your shoes in the corner of the room because/since/as they are very dirty

12. We went to the seaside for the weekend because/since/as the air in the city was not fresh

13. These pupils often get bad marks because/since/as they are very lazy

14. We went home before the end because/since/as they play was very long

21D

22A và D

23C

24B

8 first

9 lucky

1. festival

2. have

3. fairs

4. brightly

5. crowded

6. cooked

7. family

8. lucky

9. first

10. love

11. well

12. wishes

1b

2a

3c

4b

5d

6a

7d

8b

9c

10a

--------------

1 tomb

2its

3 wonders

4 pyramid

5 reveal

6 scientific

7 found

8 ordinary