There is ’s’ and ’u’ in the word’ understand!
--- ________ give them some good books? --- —Good idea!
--- This dress was last year's style. --- I think it still looks perfect ________ it has gone out this year.
Tom has been here ________just one year, but his father has worked here ________ ten years ago.
--- Our country ______ a lot so far . --- Yes. I hope it will be even ______ .
--- Which city has ________ population, Shanghai, Hong Kong or Qingdao? --- Shanghai, of course.