Though he is a manager of a big company, he makes ______ a rule to have supper with his family every day.
Our school has two months ______ in the summer time.
_______ all the pop singers, I like Xu Song ________ because of his voice.
She is one of _________ in our class.
We have to the questions before answering them.
He often knocks our books _______the floor. A. into B. onto C. off D away