Listen! Is Kitty in the next room? —- No, it ______ be Kitty. She has gone to Beijing.
Do you think we can get to the village before dark,Daddy? -Yes,honey,the car doesn’t break down.
_____is too hard _____ a good solution to this problem.
Excuse me, where are we going to have our class meeting?—I’m not sure. Ask Li Hua, please. He _________ know.
I always go to sleep ___________ the light on.