Unit 3. LOOK BACK!

1. Complete the sentences using ‘discover’, ‘discovery’ or ‘invent’, ‘invention’ in the right form.
1. Writing was probably the most revolutionary of all human inventions.
2. The 15th-17th centuries were the time of great geographic discoveries.
3. Who invented the computer?
4. Penicillin was discovered by Alexander Fleming.
5. In what country was money first invented?
6. When did they discover oil in the North Sea?
7. The discovery of the atom meant the beginning of a new era in physics.
8. Australia was discovered for Europeans by James Cook.
9. The mobile telephone is a wonderful invention.

2. Put a name to each of these sciences.
a) Physics; b) Biology; c) Math; d) Geology; e) Engineering; f) Astronomy; g) Chemistry; h) Botany; i) Zoology; j) Microbiology.

3. Match the inventions and discoveries with the people and dates and write sentences about inventions/discoveries using the Passive Voice.
1. The first calculating machine was invented by Charles Babbage in 1812.
2. Electric current was discovered by Thomas Edison in 1879.
3. A petrol driven car was invented by Karl Benz in 1885.
4. The law of gravitation was discovered by Isaak Newton in 1665.
5. The electric light bulb was invented by Michael Faradey in 1825.

6. Write out the eco-friendly words into your notebook.
Eco-friendly words: planting trees, alternative energy, going vegetarian, solar energy, wind power generators, joining the Eco-movement, taking part in anti-fur protests, joining animal rights campaign, riding a bike.

7. Match the words with their definitions.
1-f: to pollute — to make dirty;
2-e: to reduce — to make smaller in size;
3-d: to cause — to make happen;
4-c: waste — no longer of use;
5-b: poison — substance causing death or harm if taken by a living thing;
6-a: environment — surroundings, circumstances, influences.

8. Complete the sentences with the appropriate modal verbs.
1. We should recycle things to get rid of garbage.
2. One tone of recycled paper can save 17 trees.
3. People have to protect all the forests as they are keys to our survival.
4. We must be interested in saving more animals.
5. People shouldn't kill the African elephant for its tusks.
6. Eco-friendly people could keep the environment clean.
7. You mustn't turn up the heating all the time to reduce the use of energy.

8. Complete the sentences with the appropriate modal verbs.
1. We should recycle things to get rid of garbage.
2. One tone of recycled paper can save 17 trees.
3. People have to protect all the forests as they are keys to our survival.
4. We must be interested in saving more animals.
5. People shouldn't kill the African elephant for its tusks.
6. Eco-friendly people could keep the environment clean.
7. You mustn't turn up the heating all the time to reduce the use of energy.

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