David，is that man your Chinese teacher?—It___________ be him．He’s having a meeting．
Mother’ s Day is coming . I’ m thinking about _____ .
Listen! Is Kate playing the piano in the room? —No. It _________ be her. She has gone to London with her parents.
My train will leave _____ ten so I have to get to the station before nine forty.[ ]
Not onlyhelp him with his maths, but you should help him with his English. [ ]