“This is ______ most useful reference book, ” Mr. Lee told us in ______ class.
---Why did you put the wood near the fire? It’s dangerous. ---Don’t worry. Wet wood won’t _______.
He’s unlucky, and he’s always suffering _____ luck one after another.
______ part that women _______ in society is great.
You are really very kind. I’ll never forget the _________ you have done to me.
A computer is so useful a machine ________ we can use everywhere.