You ... study online
have to
You ... panic
shouldn't
You ... wash hands
must
You ... greet people with a handshake
mustn't
You ... wear a mask
have to
You ... do your homework
have to
You ... buy too much toilet paper
shouldn't
You ... go for a walk in the park
can't
You ... travel abroad
can't
You ... touch your face
mustn't
You ... stay at home
should