Câu VIII. Hoàn chỉnh câu thứ hai sao cho không thay đổi nghĩa so với câu đã cho.

1. No one solved the problem yesterday.

This problem................................................

2. "I have been to some English speaking countries this year." Mrs. Smith said. Mrs. Smith

3. Because Simon doesn't live near his mother, he can't visit her often.

If.................................................................

4. Yesterday her mother was sick, so she didn't go to school.

Because........................................................

Because of....................................................

1. They installed a network of wind turbines to generate electricity.

A network......................................................

1. He had introduced 20 girlfriends to his family before getting married last year.

20........................................................

2. His leg was broken, so he couldn't take part in the game.

Because of his.............................................

Because...............................................

Câu VII. Đọc đoạn văn sau và trả lời các câu hỏi. The effects of air pollution are alarming. They are known to create several respiratory and heart conditions along with cancer, among other threats to the body. Several millions are known to have died due to direct or indirect effects of air pollution. Children in areas exposed to air pollutants are said to commonly suffer from pneumonia and asthma.

Another direct effect is the immediate alterations that the world is witnessing due to global warming. With increased temperatures worldwide, increase in sea levels and melting of ice from colder regions and icebergs, displacement and loss of habitat have already signaled an impending disaster if actions for preservation and normalization aren't undertaken soon.

Harmful gases like nitrogen oxides and sulphur oxides are released into the atmosphere during the burning of fossil fuels. When it rains, the water droplets combine with these air pollutants, becomes acidic and then falls on the ground in the form of acid rain. Acid rain can cause great damage to human, animals and crops. 

1. Which is mentioned as the effect of air pollution- asthma or headache?

2. How many people are known to have died due to effects of air pollution?

3. Are harmful gases released into the atmosphere during the burning of fossil fuels?

 4. How does acid rain form?