1. "I come from Thanh Hoa" Mr. Ba said

=>Mr.Ba said that he came from Thanh Hoa

2. I'm sorry. I can't help you now.

=> I wish I could help you

3. It's very wonderful to spend a week in the countryside.

=> Spending the weekend in the countryside is very wonderful

4. The mechanic is repairing Judy's car.

=> Judy's car is being repaired by the mechanic

5. My sister was tired, but she helped me with my homework.

=> Although my sister was tired, she helped me with my homework

-> the girl who lived next the door to us is very friendly

7. It takes Minh 2 hours to do his homework every day.

-> Minh spends 2 hours doing his homework everyday

8. We were late for school because of the heavy rain.

-> Because it rained heavily, we were late for school

9. My mother made me clean the house. 

-> I was be made to clean the house

10. Mr John's son enjoys playing football.      

-> Mr John's interested in play football

công thức phân tử A là C2H6 nhưng bài này không có dữ kiện j thêm à bn?

They have to go to school, though it is raining hard.

A. finance

C. grow

that mean: ....phát triển từ cuộc hôn nhân đầu tiên

a, tác dụng với H2So4:

- mg(OH)2 + h2so4 -> mgso4 + 2h2o

- bacl2 + h2so4 -> baso4 + 2hcl

- caco3 + h2so4 -> caso4 + h2o + co2

- 2kclo3 + h2so4 -> k2so4 + 2hclo3

b, tác dụng với naoh:

mg(no3)2 + 2naoh -> mg(OH)2 + nano3

kclo3+naoh -> koh + naclo3

a. phương trình: 2Mg + O2 -> 2MgO

                                    2          1          2

nMgO=m/M = 4/40=0,1mol => nO2=0,05mol

b, VO2 = n*22,4 = 0,05*22,4 = 1,12(lit)

c, mMg = n*M = 0,1*24 = 2,4(gam)

chu vi mặt đáy là:

Sxq/h = 425/12,5 = 34dm

đáp số: 34dm

66- B

67 - D

68 - A

69 - A

70 - C

71 - B

72 - D

73 - A

74 - C

75 - B