21. Why ______ join us in the game for fun!
A. not to B. don’t C. not to D. not
22. Since we left school, we ______ each other again.
A. didn’t see B. never saw C, have never seen D. never see
23. It's high time we _____ our attention to this problem.
A. turn B. turned C. had turned D. would turn
24. No one is used to_______ at that way, I think.
A. being laughed B. laugh C. be laughed D. laughing
25. When I entered the room, I found a piece of paper on my desk, _____ “Stupid Sarah got a D!”
A. said B. which saying C. say D. saying
26. _______what friendships are based on, they are one of the important needs in our life.
A. No matter B. Since C. Once D. Although
27. _______ his help, I managed to finish the task in time.
