Many world-famous universities names are familiar ____ Chinese students. [ ]

The doctors did what they could_______ those w-ho were injured in the terrible accident.

There is ________ useful book on the desk， _________ useful book belongs to my brother．

Do you have ____ to say about your family？

Excuse me , Sir . But smoking is not allowed here. —Sorry, I didn’t see the sign. I’ll ___________________ my cigarette at once.