Had I known about this computer program, a huge amount of time and energy       .

. Mary _____ be in London because I saw her in town just now.

I can't thank you _______ much because without your help I _______ have won the first prize.

Listen! There’s a lot of noise from next door. They _____________ a party.

--- I hear you have written a novel. --- Yes, the book ______ come out in a month or so.