Mr.Green teaches computer science.
—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.
Some people________feel sick when they read a book in a car or on a boat.