Khí hidro+khí oxi=nước

canxicacbonat=canxi oxit+Khí cacbonic

Cacbon+khí oxi=khí cacbonic

octan=khí cacbonic+hơi nước

around

by installments->in installments

1.write

2.wrote

3.has written

A lion is faster than a horse

A lion runs faster than a horse

The  Great Wall was built more early tan the White House

He is always earlier than his brother

This house is decorated more beautifully than that house

This village is more beautiful than that village

The driver drives more skillfully than that motorist

This man is more skillful than that man

Minh suggested donating money to the poor people

They decided to stay at the hotel

They spents 2 days painting the house

It takes me 2 hours to do homework

Would you mind waiting a little longer?I'm busy now