BÀI TẬP BỔ TRỢ VÀ NÂNG CAO - UNIT 4
I. Fill in the blank one missing word
Conserving the World’s Natural Resources
In the decade of the 1970s, the United Nations organized several important meetings
(1)… the human environment to study a very serious problem. We, humans are
destroying the (2)… around us. We are using up all of our natural resources. We must
learn to conserve (3)… , or life will very bad for our children and our grandchildren.
There are several major parts to this problem
1. Population
Most problems of the environment come from population (4)… . In 1990 there were 1.6
billion, in 1950, 2,5 billion, 4,4 billion. In the year 2000 there will be 6.3 billion. More
people need more water, more (5)…, more wood, and more petroleum
2. Distribution
Scientists say there is enough water in the world for everyone, (6)… some countries have
a lot of water and some have only a little. Some areas get all their rain during one season.
The rest of the year is (7)…
There are huge forests in the Amazon area of Brazil. In other parts of the world there is
only (8)…
3. Petroleum
We are using up the world’s petroleum. We use (9)… in our cars and to heat our building
in winter.
Farmers use petrochemicals to make the soil rich. They use them to (10)… insects that
eat plants. These chemicals go into rivers and lakes and kill the fish there. Thousands of
people also go into the air and pollute it.
Winds carry this (11)… air to other countries and other continents.
4. Poverty
Poor farmers use the same land over and (12)… . The land needs a rest so it will be better
next. However, the farmers must have food this year. Poor people cut down (13)… for
firewood. In some areas, when the trees are gone, the land (14)… desert. However,
people need wood to cook their food now. Poor people can’t save the environment for the
(15)…

5. She left the room without anyone (see)
6. His (take) ill was quite unexpected
7. Mary is sure (pass) her examinations
8. It’s a pleasure (be) with you
9. I don’t want you (mention) my (arrive) late
10. The police suspect him of (try sell) stolen goods
11. I remember (hear) him (say) the grass needed (cut)
12. Can you manage (finish pack) these parcels alone?
13. “I’ve always loved (act)”, “I’d love (see) you (wear) a Roman toga and (recite)
Shakespeare”
14. After (get like) English through (hear) it on the radio, he finished by (study) it
15. We considered (give) her a book for her birthday, but couldn’t help (buy) her some
flowers, too
16. Our teacher has promised (help) us (prepare) for the examinations which he has put
off (hold) till next week
IV. Complete new sentences without changing the meaning of the two original
sentences given
1. He was foolish. He left such a good firm
He was
2. You want to ask for more money. You would be stupid if you don’t
You would be
3. Ring me letter. Would you be so good?
Would you
4. Open the window. Would you be good enough?
Would you
5. He worked out answer. It was clever of him
It was
6. They don’t take any part in local life. It’s silly of them
It’s
7. We can’t refuse their invitation. It would look rude

intriguing (adj)
investigate (v)
assumption (n)
survive (v)
support (v)
similar (adj)
arise (v)
theory (n)
1. A human being can … without food or water for several days but will die within
moments without air
2. The police always … murders and robberies to try to find out who committed the
crimes so that they can arrest the criminals
3. Water is … in many places, but it is rare in deserts
4. In 1916, an astronomer named Percival Lowell had a … that there were a ninth
planet, but Pluto was not discovered until 1930
5. When Pat opened a letter from the college she had applied to, she began to cry. Susan
was watching her and made the … that the news was bad. Her guess was correct: Pat
was not accepted to the college
6. Many students do not … well on examinations because they become very nervous
and tense
7. Mary suggested a two-month camping trip to the Himalayas next summer. Her
husband Tom thought the idea was … . They had never done anything so exciting
before!
8. Venus and Earth are … in size. However, the surface temperature of Venus is 600
degrees Fahrenheit!
9. It is probably impossible for life to ever … on Venus because of its intense surface
heat.
10. When Maria attends college next semester, her parents agreed to … her, so she will
not have to work.
VII. Supply the best words in the blanks of these sentences

1. John Jameson is a famous (crime) … who stole five million pounds from a bank
2. (Manage) … your own business can cause a lot of financial worries
3. The surgeons tried their best to save his life, but unfortunately the operation was
(success)…
4. I understand (perfect)… what you are saying
5. Jane’s (appoint)… as director came as no surprise
6. A holiday in America can be …. cheap (surprise)
7. My colleagues are very pleasant, but the manager was a little (friend)…
8. I (sleep)… this morning, and was late for school
X. Read this funny passage
The best swimmer
An American and an Englishman were telling each other about wonderful things
which each of them had seen with own eyes. The number of stories they had told each
other, many of which were, of course, not true, was becoming greater and greater when at
last the American said:
“When I crossed from France to England, a man jumped into the water as a boat was
leaving. He swam in front of the boat all the way and had arrived at Dover before we did!
I am sure you never saw such a splendid swimmer!”
The Englishman looked at the American and said calmly, “Is that so? Well, I was the
man”.

ANSWER FOR UNIT 4
I. 1. on 2. world 3. them 4. growth 5. food 6. but
7. fry 8. desert 9. it 10. kill 11. polluted 12. over
13. trees 14. becomes 15. future 16. conserve/ save
II. 1B 2C 3D 4C 5A 6A 7B 8B 9A 10A
III. 1. to have made 2. writing 3. solving 4. to live, to eat
5. seeing 6. being taken7. to pass 8. to be
9. to mention, arriving10. trying to sell 11. hearing, say, cutting
12. to finish packing13. acting, to see, wearing, reciting