You’ve left the light on. —Oh, ________. I’ll go and turn it off.

Did you see who the driver was?— No, so quickly_____that I couldn’t get a good look at his face.

A study shows that a kind of fish in America can live_______ water for up to 66 hours. [ ]

Our English teacher is often _______ to give a talk on English study. He is popular.

He likes low-carbon life. He lives in the house ________ he built himself out of trash.