Ответ:
1.
1. exchange 2. nurse 3. athletic 4. naughty 5. serious 6. talkative 7. ? 8. friendly
2.
1. informal 2. impolite 3. unpleasant 4. unusual 5. unlike 6. unlucky 7. unreal 8. impossible 9. non athletic 10. unhappy
3.
1. a
2. b
3. c
4. b
5. b
4.
1. d
2. a
3. b
4. c