have, have to, can, must

They ......... do their homework today because it is a holiday at the school.

I ......... go now because I am already late for my class.

I may ......... able to come to your party if I have the time.

I ......... go to see the doctor last week because I was very ill.

Do you ......... clean the house every day or every week?

I could ......... bought that car but I didn't have enough money to pay for the petrol.

I may ......... go to Paris next week because there is a very big exhibition there.

I ......... speak French without a problem now because I have had many lessons.

I ......... help you with your shopping because you have a lot of bags.

When will you ......... come and see us in our new house?