—Miss Li, must we hand in our homework right now?—No, you ____.You can hand it in tomorrow.

— Is there an express to Beijing tonight? — There ______ be, but you’d better call the booking office to make sure. 

—I heard they went skiing in the mountains last winter. —It       true because there was little snow there.

–Who is the tallest boy?–It ______  be John. Because John is of medium height..

Tommy, you____ be hooked on the Internet all day. You may fall behind others in study.