—Must I come back before supper, mum?—No, you        .

--- May I smoke here? --- If you       , choose a seat in the smoking section.

It has been announced that all the candidates______ remain in their seats until all the papers have been collected.

 -Look at the picture on the wall. It         be David's.-Yes, his name is on the first page.

If you _______ carry with you the belief that all you do is right, it’s none of my business.