I. Fill in the blanks with the words from the box:

weightless       moving         problem        is                        make                                   century

orbiting          gravity          at                   on                        heavy                                   do

Isaac Newton, an English scientist in the seventeenth (1) __________, discovered that the earth exerts a pull (2) __________ everything. The pull of the earth is called (3) __________.

Once in outer space, man (4) __________ no longer affected by the earth’s gravity. Imagine you were in a space capsule (5) __________ the earth. Sitting or lying would be a (6) __________ to you because you wouldn’t be able to keep your chair or bed then. How would you (7) __________ water flow into your mouth when, without gravity, your drinking water had no weight to move ? Astronauts should, therefore, be carefully trained to face these (8) __________ conditions.

II. Give the correct tense or form of the verbs in parentheses :

1. Do you consider (invite) __________ Jane and Jim to your birthday party ?

2. There are many signs (tell) __________ people (be) __________ careful when (come) __________ near the wild beast.

3. Would you mind (shut) __________ both of those windows ?

4. That follow seems (trust) __________ by everyone.

5. The first fish (appear) ____________ on the earth about 500 million years ago. Up to now, over 20,000 kinds of fish (name) ____________ and (describe) ____________ by scientists. New species (discover) ____________ every year, so the total increases continually.

6. Sally reminded me (ask) ___________ you (tell) ___________ Bob (remember) ___________ (bring) ___________ his soccer ball to the picnic.

Viết một đoạn văn từ 8 đến 10 câu trình bày luận điểm : Vai trò của bảo vệ môi trường.

I. Read the passage, make questions and answer them.

Wild animals and wild places where they live are seriously threatened almost everywhere. One species has become extinct in each year of this century; but many hundreds are now in danger. Lack of attention would lead to the rapid advance of the process of extinction.

Already many kinds of wild animals have been so reduced in number that their role in the ecosystem is forgotten.

          But even more important, perhaps, than individual kinds of animals and plants, whole habitats are in danger of vanishing : marshes are being drained, and the world forests, especially the tropical forests are being cut down to satisfy man’s need of timber and paper.

          1. Where / wild animals / live ?

          - _____________________________________________

          - _____________________________________________

          2. Why / forests  /  be cut ?

          - _____________________________________________

          - _____________________________________________

          3. What / happen / wild animals / if / forests / disappear?

          - _____________________________________________

          -______________________________________________

II. Use the correct word forms.

          1. Conservation is the _____________ and preservation of natural resources. (safeguard)

          2. Salt has a ______________ effect on food. (preserve)

          3. The fight against ___________ is an important part of conservation. (pollute)

          4. Carbon monoxide is a ______________ gas. (poison)

          5.  ______________ pollution is one of serious problems facing the mankind today. (environment)

6.  ______________ land consists of irrigating deserts, draining swamps and pushing back the sea. (reclaim)

          7. We can conserve our environment by ______________ of waste. (prevent)

          8. Farmers can protect their land by ______________ rotation of crops. (year)

          9. Farmers can help enrich the soil by adding ______________ (fertilize)

          10. Preserving natural resources is a great ______________. (important)

II. Supply the correct word form.

            1. I should choose this in ______________ to any other. (prefer)

            2. He is unhappy because of his _____________ (deaf)

            3. The government want to ____________ this training center. (military)

            4. The advantage is that it leaves healthy cells ___________ (harm)

            5. A laser __________ the bone without touching any of the  surrounding tissue. (vapor)

            6. She was used to __________ on a picnic at weekends. (go)

            7. Carbon dioxide occurs in the air in __________ form. (nature)

            8. He is always ready to give assistance to his friends. He is ________ to them. (help)

            9. This company offered a lot of __________ jobs. (attract)

            10. The result of the test was _____________ (satisfy)

III. Give the correct preposition.

            1. Preserving natural resources is ________ great importance.

            2. I’ll have some tickets available ________ you.

            3. Why are you working so late? Are you aware ______ the time?

            4. The boy is afraid ______ the dark.

            5. Is she serious _______ learning to be a pilot?

            6. Smoking is harmful ______ your health.

            7. The child is very quick _____ arithmetic.

            8. The weather seems perfect ______ a picnic.

            9. Attending all the lectures is important ______ us.

            10. What he said was contrary _______ his thought.

IV. Finish each of the following sentences in such a way that it is as similar as possible in meaning to the original sentences :

1. We can’t work. We don’t use a good dictionary.

- Without _____________________________________________

2. He must practise it everyday. That is the only way for him to be successful.

- Only by______________________________________________

3. He is going to retire at the end of the term. It was decided.

- The fact that__________________________________________

4. His father didn’t want to watch TV. His wife didn’t want to watch TV.

- Neither_______________________________________________

5. He was ill. He went to school.

- In spite of____________________________________________

6. Think carefully. Answer my question.

- Before _______________________________________________

7. I can’t cook as well as my mother does.

- My mother ___________________________________________

8. Unless it stops raining,we won’t go out.

- If ___________________________________________________

9. She cooked better than you did.

- You _________________________________________________

10. Unless someone has a key,we can’t get into the house.

- We can only __________________________________________

11. Because of her carefulness, she didn’t make any mistakes in her answers.

- Because _____________________________________________

12. She said, ‘I spent my holiday in Italy last year.”

- She said _____________________________________________

13. She didn’t buy it because the price was too high.

- Because of ___________________________________________

14. We didn’t go on holiday because we didn’t have enough money.

- If ___________________________________________________

15. The question was so difficult that we can’t answer it.

- The question was too___________________________________