-Listen! Is Mary playing the piano in the room? --No. It ________ be Mary. She has gone to Hong Kong.
----- Betty telephoned to say welcome back. ------Really? _______.
The famouse writer Lin Qingxuan ______to come to our school to give a speech again.
Who can _____that he finished his task alone?
---Would you like to drink? Tea, coffee or milk? ---Oh, kind of drink is OK, thanks.
---Do you mind my opening the window? It’s a bit hot. ---.