---Listen! Is Kitty in the next room?  ---No, it ______ be Kitty. She has gone to Beijing.

He failed in the driving test again. He         .

 －Is Mr. Li in his office ?－No, he __________ in the office. He’s ill in hospital.

 --Listen! Marry is singing in the next room. -- It __   ___ be Marry. She has gone home.

——Who’s that man? Is he Mr. Brown?——That    be Mr. Brown. He never walks this way.