nockedat the door—I’ve no ideaI just pretended nobody was at home, so I didn’t ask who ____ was

John has put forward _______ most challenging question for us to answer.-Yes, it really is. I have never heard _______ harder one.

The police officers in our city work hard _____ the rest of us can live a safe life

Her concert was ______ big successslast night.—I think it surely makes ______ differencefor a new talent.

Jim is _____ .