Which of these examples correctly uses the negative form of the modal verb have/has to?

If you have a fever, it is important that you stay at home.

You didn’t have to throw away all of the chocolate. You could still have eaten some!

Supermarkets didn’t have enough supplies during the pandemic.

During the coronavirus pandemic, I know you had a lot of times where you felt lonely.

In order to boost your immune system, you have to take vitamins.