I think that you ___ tell her that you are sorry.
should
You____use your flash inside the Museum, it's forbidden.
mustn't
You____drink that. It's poison.
mustn't
What are you doing? You ___ be here!
mustn't
We ___ go for a drink one day.
should
I ___ wear glasses, I can still see perfectly well.
don't need to
We went to bed right after dinner because we ___ get up early the following day.
had to
All children____fasten their seatbelts when travelling by car.
must
I think you_____wear that dress. It doesn't suit you.
shouldn't
You ___ be an expert to use the basic functions of program.
need to
You____ be very rich to go skiing nowadays.
don't need to
We ___ talk to each other because we are doing an exam.
mustn't
We ____take our food to school. We went to the canteen.
don't need to