--- Who knocked the door? --- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ______ was.
To be honest, a lot of people attach great importance to ______rich and famous.
He is the first person you can think of to rely on, for he is always willing to ________ whoever is in trouble.
—Why do you look so worried?
It won’t be quite a long time ________ your son is back, so don’t be worried.
—What's the matter with the man hanging his head there?—Well,if you ________ know, he was caught stealing my bike.