Healthy food and exercise help ________to study better. A. us B. we C. our
—Excuse me,when are we going to have a picnic? —I’m not sure.Ask our monitor,please.He________know.
—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.