a) 1 :8:1:2:4

b)4:1:2:4

c)2:1:3

d)2:2:4:1

Cao :( 40 + 16 ) = 56

NH3 :(14+1.3) = 17

FeSO4 :(56+32+16.4) = 152

Fe2(SO4)3 : {56.2 + ( 32+ 16.4).2 } = 400

AlPO4 :(27+31+16.4) = 122

1. This is the first time , I tasted such a gook cake

2.I last saw him two weeks ago

3, I have learnt English for 7 years

4.We elect Nam to be the monitor of our class

5. It's the first time I have seen such a wonderful computer

6.No one in Tom's company is as good at programming as him

1. Nam said “I am told to be at school before 7 o’clock”

=> Nam said that he was told to be at school before 7 o'clock

2. Thu said “All the students will have a meeting next week”

=> Thu said that all the students would have a meeting the following week

3. Phong said “My parents are very proud of my good marks”

=>Phong said that His parents were very proud of his good marks

4. The teacher said “All the homework must be done carefully”

=> The teacher said that all the homework had to be done carefully

5. Her father said to her “You can go to the movie with your friend”

=> His father sid to her that she could go to the movie with her friend

6. Hoa said “I may visit my parents in the summer”

=>Hoa said that she might visit her marents in the summer

7. The teacher said “We can collect old book for the poor students”

=> The teacher said that they could collect old book for the poor students

8. She said “She doesn’t buy this book”

=> She said that she didn't buy that book

9. The boys said “We have to try our best to win the match”

=> The boy said that they had to try their best to win the match

10. Her classmate said “Lan is the most intelligent girl in our class”

=> Her classmate said that Lan was the most intelligent girl in their class

11. They told us “Our friends will get the award for their highest scores”

=> They said to us that Their friends would get the award for their highest scores

12. He said “I will go to school by bus tomorrow”

=> He said that he would go to school by bus the next day

13. Phong said “I need to learn more vocabulary”

Phong said that he needed to learn more vocabulary

14. His brother told him “You can use my computer today”

=>His brother said to him that he could use his computer that day

15. Mai said “I can not go to the movies with you, Nam”

=> Mai said to Nam that she couldn't go to the movies with him

1.This flower is watered by my father every morning

2. The secetary was phoned by the manager this morning

3.This house and these cars are going to be painted for Christmas day by the green

4.The pollution problems have been disscussed by the students since last week

1.A 2. D

3.B 4. B

5.C

ko dd

1.He ran up the staies to see what happend next

de bai la j vay

1. successful ( thành công )

2.urbanized(đô thị hoá)

3.uncomfortable(không thoải mái )

4.performance(màn biểu diễn)

5. dangerous(nguy hiểm)

6.appliances (dụng cụ)

7.informative( nhiều thông tin)

8.unfortunately

9.(không may)

10.nationality (Quốc tịch)