Here are the correct choices for each sentence:

3. **much** - "How much cheese do you want?"
4. **much** - "There isn’t much cake. How about a little biscuits?"
5. **few** - "Can I have a few apples, please?"
6. **much** - "How much apple juice is there?"
7. **much** - "How much money do you need?"

So the answers are: much, much, few, much, much.