In my opinion, Jack, though relatively stubborn, was not too difficult ___

When did the old man die—In 2008. He________ for nearly five years.

So quickly is a possibility today may be a reality tomorrow.

Teachers should allow their students to study ________ from the start, and it is bound to result in their ability to deal with problems on their own.

This is ________ public place for us to do some reading. Don’t talk or laugh loudly in _____ public.