I hate ____ when people talk with their mouths full. 

 ______ is necessary for everyone to obey the traffic rules.

_______ was known to them all that William had broken his promise ______ he would give each of them a gift. 

I can’t go there with you; I have ______ to do.

—There is still a copy of the book in the library. Will you go and borrow         ? —No, I’d rather buy         in the bookstore.