It is my ______to check that all doors and windows are locked after everybody leaves .
—What about _____concert? —Coco Lee’s concert? To be honest, to buy ____ticket of hers is out of the question at the moment.
This cake is very sweet. You ______ a lot of sugar in it.
—Catherine, I have cleaned the room for you. —Thanks. You _____it. I could manage it myself.
He paid for a seat, when he _____ have entered free.
—Do you know where David is? I couldn’t find him anywhere. —Well. He _____have gone far—his coat’s still here.