Unit 9水平测试
笔试部分(共80分)
I. 单项选择(15分)
( )21. They are going to watch a movie _______ Friday night.
A. in B. at C. on D. for
( )22. I got ________ invitation from Mary. She asked me to go to ____ concert with her.
A. a; a B. an; the C. an; / D. a; the
( )23. —What do you usually do on vacations, Cindy?
—I usually go to _____ my grandparents.
A. visit B. teach C. babysit D. call
