C. two-week’s D. two weeks’

16. __________ room is on the 5th floor. A. Lucy and Lily B. Lucy and Lily’s C. Lucy’s and Lily D. Lucy’s and Lily’s

17.I like that son of __________. A. John’s sister B. John sister’s C. Jo hn’s sister’s D. John’s sister s

18.On __________, all the children can play games all day. A. Children’s Day B. Childrens’ Day C. The Children’s Day D.children day

19.This is not my cap, but my __________. A. brothers

B. brother’s C. brothers’ D. brother

20. Tom's car is more beautiful than__________. A. his brother's and sister B. his brother and sister C. his brothers and sisters D. his brother's and sister's

21. I’ll go and call at __________ right after scho ol. A. the doctor B. the Smiths C. Smith D.my uncle’s