—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
It's nearly seven o'clock . Jack _____ be here at any moment .
Mrs Green wants to buy that kind of cloth because she ____ that the cloth ____very well .
---When ______ and visit our exhibition next month ? -- -When _______ , I will let you know .
Michael ______ here to see you and he ______ a note on your desk .
---How long _______ each other before they ________ married ? ---For about a year .