Based on 4c, ex.4

Choose the correct word.

1. A.
   [Must|May]
   I use a reusable lunch box instead?
   B. Yes, of course.
2. A.
   [Should|Would]
   you like me to take the vegetable waste out to the compost heap?
   B. No, you [mustn't|don't have to]. Your brother has already done it.
3. A. Would you like to buy an animal adoption certificate?
   B. Yes, I certainly [can|would].
4. A. I use silver paper to wrap my packed lunch.
   B. You really [shouldn't|can't]use silver paper as it produces waste.