After the long journey, the three of them went back home, _________

People can accept the fact that prices tend to rise year by year but at a(an) ______ rate.

The letter was______as it was the only one ever signed by the the Queen.

Mistakes don’t just happen；they occur for a reason. Find out the reason，and then making the mistake becomes________.

He didn’t understand the _______ question, so there was a ______ expression on his face.