You … keep pets in the hostel. It's not allowed. 1.cannot
2.must not
3.may not
4.don't must
It's cold outside. You … put on a hat and a scarf.
1.should
2.can
3.must
4.shoold
The lake is rather deep. … you swim?
1.Must
2.Can
3.May
4.Should
His English is so bad, that I … understand anything.
1.shouldn't
2.may not
3.must
4.can't
Students ... arrive in class on time!
1.mustn't
2.shouldn't
3.must
4.should