—Is that man Mr Hu?—That ______ be Mr Hu. Because he has gone to Japan with his wife.

--- Can we leave the classroom now?-- No, you ______. You ______ to leave until the bell rings.

——Can I walk across the road now, mum?——No, you_______. You have to wait until the light turns green.

------Is this ruler Mary’s?------No, it _______Mary’s. Hers is on the desk..

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