---Who’s the man over there? Is it Mr. Black?--- It _________ be him. He’s much taller.
Don’t spend __________ time playing computer games . It’s bad for your eyes.
Is there _____________ in today’s newspaper?
If we ________ careful, fire can be dangerous.
Miss Li came into the classroom ____ a smile _______ her face.
His friend found______________ to tell him the truth .