— Look at the black clouds. It ____ soon.— Sure. If only we ____ out.
If I’m mistaken, _________ you are mistaken too.
The result of the study was published last week in New York, a ______ magazine in America.
She read the letter through before sending it, ______ for spelling mistakes.
“You’ve left the light on.” “Oh, so I have. _____ and turn it off.”
New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.