—You are required by law _______ seat belts.—Thanks for your reminding. I’ll do it right away.

The room is empty except for a bookshelf _____ in one corner.

Last summer holiday, I went back to my hometown, _______ the neighbors and the house _____ I used to be familiar with were gone. 

I have a lot of readings _____ before the end of this term.

Mr. Smith stood up in defence of the 16-year-old boy, saying that he was not the person ____.