Show me your homework, Dave—-Sorry, Mr. Brown. I _______it at home.

The current international financial crisis is affecting most countries in the world—Would it be at least several years ____ everything returns to normal?

extremely hot this summer. __________,many people say it has been the hottest in the past 30 years.

How often do you clean your room— .

Who should be responsible for the accident— The boss, not the workers. They just carried out the order______.