Look! Mrs. Green is talking ____ the students of ClassⅠon the ground. [ ]

His father looks young, but in fact he is ______.

Hello, Betty! Where are you now?— I ________ on the Great Wall of China and talking to you.

Who’s your best friend? Is ____ a boy or a girl?—A boy. I often play with _____ after school.

Peter doesn’t tell me when he _______. I’ll telephone you as soon as he ______.