Ben needs a new jacket to keep ________the cold.

Who’s singing in the garden—It ________ be Tom. He always practices singing at this time.

failed twice in the college entrance exam,making people consider him as _____ failure. But now he has won ______ splendidsuccess in business.

Either you have made amistake or he has— I _________

Why are those people gathering in the middle of the street?—I don’t know. There ________ be an accident.