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Preparation:
1. d
2. e
3. a
4. b
5. f
6. h
7. c
8. g
1. Check your understanding: gap fill
1. 23
2. 5 billion
3. 150 million
4. Five
5. Six
6. 10 billion
2. Check your understanding: true or false
1. False
2. False
3. True
4. False
5. True
6. False
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