--What should I get my grandma for her birthday? -- Why ___ you ____ a scarf?
--He’s never visited the USA before, ________ he?--___________. He plans to go there again next summer.
Don’t get off the bus __________ it stops.
--How long ________ you _________ this book?--For about one week. I ________ it from the library last Tuesday.
---Has he returned from Canada_________?--- Yes, he’s _________ come back.
--Where is Mr. Smith? ---He ___ Guangzhou. He ____ there for a week.