This is only request that the room ________ after being used.[ ]

Who will give us the speech on public manners— Mr. Smith___________, but I’m not sure.

They are just college graduates and don’t realize _____ to start and run a company

He may be________of playing his radio tooloudly by law，especiallywhen it is time for sleeping.

Fred entered without knocking and, very out of breath, sank _____ a chair[ ]