______ the sound on the step, the boy rushed out to see if his mother had come back.
—Why did Mr. Green take his 7th grade students to the river yesterday afternoon? —________ the river.
The government promises that relief materials ________ to the flood-hit areas in no time.
—Did you see ________ man in ________ black pass by just now? — No, sir. I was reading a newspaper.
When our ancestors were hunters and gatherers 10,000 years ago, they didn’t have time to wonder much about ________ but finding food.
His wife was busy cooking while he watched TV ________ comfortably in the sofa.