--Mum, have you seen my U-Disk?--____________ you bought last Sunday? I'm afraid I haven't seen ________.
The sunlight came in____________ the windows in the roof and lit up the whole room.
The harder you work,____________.
--Do you like the material? --Yes, it ___________ very soft.
--Where is Xiao Wang? --I don't know.He__________ be in the library.
Bread and butter____________ for breakfast in many Chinese homes nowadays.