— Can I pay the bill by check?— Sorry, sir. But it's the management rules of our hotel that payment ______be made in cash.

One of my friends _______ moved to America. I miss her so much.

According to the school rules, no student _______ go out of school without the permission of the teachers.

--- Must I stay at home, Mum?--- No, you_____

One of our rules is that every student ______wear school uniform while at school.