Ответ:
1. b
2. a
3. c
4. b
5. d
6. a
7. b We should keep water clean and the air fresh.
8. 1. a
2. e
3. d
9. 1, 3
10. 1. b
2. d
3. a
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Answers & Comments
Ответ:
1. b
2. a
3. c
4. b
5. d
6. a
7. b We should keep water clean and the air fresh.
8. 1. a
2. e
3. d
9. 1, 3
10. 1. b
2. d
3. a