The key answer of exercise 2

a)

1. a, b
2. b
3. b, c
4. c
5. a, b, c
6. b
7. b
8. a
9. c
10. a
11. a
12. b

b)

1. aren't enough; too few
2. enough; too expensive / too much
3. a little; much
4. too many; enough
5. no; any
6. few; many

c)

1. many people
2. much money
3. any buses
4. very few people
5. old enough
6. very little / no work
7. too much / a lot of / lots of / loads of furniture
8. no paper
9. a lot of / lots of / loads of traffic
10. too many / a lot of / lots of / loads of children
11. a few / some phone calls
12. too small