Choose the most suitable option to fill in the blanks: ( MODALS)

1. I didn't feel very well yesterday. I ________ eat anything.
a) couldn't
b) cannot
ç) mustn't

2. If you don't start working harder, you _______ repeat the course next year.
a)have to
b) must
c) will have to

3. Entrance to the museum was free. We ______ pay to get in.
a) needn't
b) didn't need to