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3. arrive – arrived, 4. helped – help 2. WEATHER CONDITION
5. change – changed , 6. invent – invented 3. GLOBAL WARMING
READING; Exercise 1 4. BOTTLED WATER
1. T, 2. F, 3. T, 4. T, 5. T, 6. F, 7. F, 8. T 5. SEA LEVEL
Exercise 2 6. WATER SHORTAGE
1. important, 2. changed, 3. works on, 4. discoverer Vocabulary 5; Exercise 1
5. scientists, 6. Few, 7. scientific, 8. actions 1. releasing / melting, 2. look, 3. turn off
Exercise 3 4. cut down, 5. get, 6. shoulder, 7. approaching, 8. run
1. C, 2. A, 3. C Grammar; Exercise 1
1. will, 2. won’t, 3. will run, 4. will be
UNIT 10 - NATURAL FORCES 5. will have, 6. will decrease
Vocabulary 1; Exercise 1 Exercise 2
1. volcano, 2. erosion, 3. earthquake, 4. drought 1. because, 2. because / otherwise, 3. so
5. flood, 6. tornado 4. because, 5. and, 6. but / So
Exercise 2 Exercise 3
1. erosion, 2. tsunami, 3. hurricane, 4. landslide 1. so, 2. but, 3. otherwise, 4. but, 5. because, 6. so
5. avalanche, 6. earthquake READING
Vocabulary 2; Exercise 1 Exercise 1
1. rechargeable, 2. bottled, 3. harmful, 4. misused 1. F, 2. T, 3. NG, 4. T, 5. F, 6. F, 7. T, 8. F
5. renewable, 6. dirty Exercise 2
Exercise 2 1. Water shortage, extreme weather conditions
such as more intense storms, more rain, and drier
1. ENORMOUS, 2. LOCAL, 3. DRY, 4. POWERFUL
droughts, extinction of most of the animals and
5. SPECIFIC, 6. WIDESPREAD plant species.
Vocabulary 3; Exercise 1 2. By releasing heat-trapping gases to the
1. precautions, 2. extinction, 3. magnitude atmosphere.
4. shortage, 5. resources, 6. environment 3. Because they can absorb harmful gases.
7. temperature, 8. destruction Exercise 3
Exercise 2 1. C, 2. D, 3. A
1. studies, 2. balance, 3. reasons, 4. Forests
5. amount, 6. rate, 7. value, 8. responsibilities
9. generations
Exercise 3
1. sheet, 2. deforestation, 3. planet, 4. glacier
5. rainforest, 6. storm, 7. coast, 8. trash
Exercise 4

Vocabulary 4; Exercise 1
1. earthquake emergency kit
2. agricultural areas
3. Climate change
4. water shortage
5. natural forces
6. rechargeable batteries
Exercise 2
1. NATURAL FORCE

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