It took us ____ to finish the new work.A. three hour and a halfB. three and a half hourC. three and a half hours
—Whose is the pencil box? —It________be Tom’s.Look at his name on the cover!
—Morning,class.Is________here? —No,sir.Tom is absent.
—Are those books________? —No,they are not mine.They belong to________.
—Do you hear the noise outside? —Yes.There must be some kids________outside.
—Tom,where is your father? —I’m not sure.He________in his office.