There is ________ food. It’s enough for us to eat for a week.

He is so careless that he often his school things at home.

Are Mr. and Mrs. Black at home? — No. ________ of them are at work.

Look at that girl. Is it Susan?–No, it _______ be her. She has gone back to her home town .

Mark Twain it famous ______ a writer ______ writing short stories.[ ]