You _____ take any pictures.
mustn't
You _____ be quiet.
must
You ______ talk quietly.
can
You _____ make a mess at home.
mustn't
You _____ ask questions.
can
You _______ talk to your teacher rudely.
mustn't
You _____ do your homework in a library.
can
You _____ look both sides before crossing.
must
You ______ do your exam carefully.
must