BT7. Nung canxi cacbonat CaCO₃ thu được vôi sống CaO và khí cacbonic CO₂:

Biết khối lượng canxi cacbonat CaCO₃ đem nung là 500 gam, khối lượng vôi sống CaO thu được bằng 182 gam. Tính hiệu suất của phản ứng.

III.       Choose the word or phrase that needs correcting.

1.         The children were frightening by the thunder and lightning.

2.         Two people got hurt in the accident and were took to the hospital by an ambulance.

3.         The students helped by the clear explanation that the teacher gave.

4.         That alloy is composing by iron and tin.

5.         The winter of the race hasn’t been announcing yet.

6.         Progress is been made every day in all parts of the world.

7.         When, where and by whom has the automobile invented?

8.         Each assembly kit is accompany by detailed instruction.

9.         Arthur was giving an award by the city for all of his efforts in crime prevention.

10.       It was late and I was getting very worry about my son.

IV.       Find a mistake in the four underlined parts of each sentences and correct it.

1.         My sister had worked in the bank for five years before she had been sent to Da Nang.

2.         Tom said that he had been very excited visiting Ha Long Bay for the first time in 2005.

3.         The country has significant changed since we came here in 2007.

4.         All of us are astonished that life in the countryside to improve a lot.

5.         By the time she left the shop, she spent all of her money on clothes.