Here are the correct answers for each blank:

1. **to** - "Both men and women now work to contribute **to** the family finances."
2. **out** - "John is responsible for taking **out** the rubbish."
3. **for** - "My father is responsible **for** the household finances."
4. **for** - "My mother cooks and shops **for** groceries."

So the complete answers are:
1. B
2. C
3. C
4. D