Решение:
- How much sugar do you want in your coffee? (Sugar - неисчисляемое)
- There are very few apples left. We need to buy more. (Apples - исчисляемое, мало)
- I have a lot of friends at my new school. I'm very happy. (Friends - исчисляемое, много)
- She drinks very little water every day. (Water - неисчисляемое, мало)
Ответ: 1. much; 2. few; 3. a lot of; 4. little.