The teacher talked with Jack, _______ problems was poor study habits.
Water, which seems so simple and common, is_________makes life possible.
You may take _________ half of the cake; they’re exactly the same.
Sorry, I’m late. The car _________down on my way here.
250.Mr. Brown works in_________middle school. It is_________school built in the 16th century.
_________I know the exam isn’t difficult, I shall not worry about it.