mum
                    - Mum, I’m stressed out.— I think you ____ listen to some music..
 - Listen, Mum. I heard the footsteps. Is it Dad? —It ___ be him. He’s gone to Beijing on business this morning.
 - Mum,I watch TV now ? —No, you finish your homework first.
 - Mum this time yesterday.
 - Mum, why don’t you have the robot ________ housework for you?— Oh, it caught a virus, I should have it _________ at once.
 - Mum ________ clothes, so I have to look after my younger sister.
 - This is the computer ______ Mum gave me for my birthday.
 - This is the computer ________ Mum gave me for my birthday.
 - Mum, _______ is my friend, Jim. — Nice to meet you.
 - Mum, Mary bought a pet dog yesterday. Could you please buy __________ for me? — Sure. But you must look after it yourself.