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Câu trả lời:

IIIFCLAUSE 

1. You had trouble at school because you didn’t do your homework.(using IF)

=> If you had done your homework, you wouldn't have had trouble at school

2.  Mel doesn’t ask her teacher so he doesn’t  answer her questions. (inversion of IF_clause

=>  If Mel asked her teacher, he would answer her questions

3. they  do not listen carefully so they can’t hear the woodpecker. (inversion of IF_clause)

=>  If they listened carefully, they could hear the woodpecker.

4. If I had lain down on the sofa, I would have fallen asleep.

(inversion of IF_clause)

=> Unless I had lain down on the sofa, I would not have fallen asleep

5. If you gave the young boy this stick, he’d hurt himself. (inversion of IF_clause)

=> Unless you gave the young boy this stick, he’d not hurt himself.

6. The students didn’t solve the problem because they didn’t use their textbooks. (using IF)

=> If the students had used their textbooks, they would have solved the problem

7.  He doesn’t wash his feet more often so his girlfriend doesn’t visit him more often. (inversion of IF_clause)

=>  If he washed his feet more often, his girlfriend would visit him more often

 IIIRELATIVE CLAUSE 1. The house has been built in the forest. It doesn’t have electricity. (Using WHOWHOMWHICH) ____ The house which doesn't have electricity has been built in the forest

_________________________________________________________

2. Do you know the man? He is coming towards us. (Reduction of  relative clause) _____ Do you know the man who is coming towards us?

________________________________________________________

3. I sent my parents some postcards. They were not so expensive. (Using WHO/ WHOM/ WHICH) ____  I sent my parents some postcards which were not so expensive

_________________________________________________________

4. I come from a city. The city is located by the sea. (Reduction of  relative clause)

_______ I come from the city which is located by the

sea______________________________________________________

5. The soup was so delicious. I had it for lunch. (Reduction of  relative clause) __________  The soup was so delicious which I had for lunch___________________________________________________

6. The first student has to clean the board.  He comes to class  (Reduction of  relative clause) ____  The first student who comes to class has to clean the board_________________________________________________________ 7. The only room  was Mary’s.  It was painted yesterday (Reduction of  relative clause) _________ The only room painted yesterday was Mary's____________________________________________________

8. She is talking about that  author . His book is one of the best-sellers this year. (Using WHO/ WHOM/ WHICH) _______ She is talking about the author whose book is one of the best-sellers this year______________________________________________________

9. He bought all the books . They are needed for the next exam. (Using WHO/ WHOM/ WHICH)

__________ He bought all the books that are needed for the next exam___________________________________________________

10. Those children are taught well. Their parents are famous teachers (Using WHO/ WHOM/ WHICH) ______ The children, whose parents are famous teachers, are taught well_______________________________________________________ 11. Do you know the boy? we met him at the party last week?  (Using WHO/ WHOM/ WHICH) ___________ Do you know the boy whom we met at the party last week?__________________________________________________

12.  Was Neil Armstrong the first person? He set foot on the moon  (Reduction of  relative clause) _______ Was Neil Armstrong the first person to set foot on the moon?______________________________________________________

Câu trả lời:

 

Water pollution is a major global problem which requires ongoing evaluation and revision of water resource policy at all levels. It has been suggested that water pollution is the leading worldwide cause of deaths and diseases, and that it accounts for the deaths of more than 14,000 people daily. An estimated 580 people in India die of water pollution related illness every day. About 90 percent of the water in the cities of China is polluted. As of 2007, half a billion Chinese had no access to safe drinking water. In addition to the acute problems of water pollution in developing countries, developed countries also continue to struggle with pollution problems. For example, in the most recent national report on water quality in the United States, 44 percent of assessed stream miles, 64 percent of assessed lake acres, and 30 percent of assessed bays and estuarine square miles were classified as polluted. The head of China’s national development agency said in 2007 that one quarter the length of China’s seven main rivers were so poisoned the water harmed the skin. Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, such as drinking water, or undergoes a marked shift in its ability to support its constituent biotic communities, such as fish. Natural phenomena such as volcanoes, algae blooms, storms, and

earthquakes also cause major changes in water quality and the ecological status of water.

1 . What is the leading worldwide cause of deaths and diseases?

=> Water pollution is the leading worldwide cause of deaths and diseases

2 .  How many people die every day by water pollution?

=> More than 14,000 people

3 . How many percent of the water in the cities of China is polluted?

=> 25% of the water in the cities of China is polluted

5 . What phenomena cause major changes in water quality and the ecological status of water?

=> Volcanoes, algae blooms, storms, and earthquakes.