Which floor do you live on, Bob?
I live on the floor. There are floors in our building.( )
twelfth; twenty
twelfth; twentieth
twelve; twenty
twelve; twentieth
--_____ you ever ____ to Beijing? -- Yes, I went there last year.
---Isn’t the trip boring? --- . I’d like to sleep at home instead of going out.
-____you ever ____with a group? -Yes, I have .
---_______ he _______ from Beijing? ---No, he _______.
------ __ does your father go to see your grandmother ? ------Once a month .