Choose the word or phrase that best complete each sentence below.
21. Richard: “Do you enjoy doing the school Quiz?”
      Gabriel: “_____”
A. Of course, I will.                                B. What’s the matter?
C. That’s the least I could do.                        D. It was lots of fun.
22. Tyler: “Let’s buy this pink purse for Mum!”
      Selena: “_____”
A. Yes, you’re right.                                B. Good idea!
C. I’m fine, thanks.                                D. You must be a fool!
23. My sister is keen _____ sports. She plays a lot of tennis and badminton in her free time.
A. on                        B. of                        C. about                        D. at
24. Quang is good _____ Math, he can solve any problem very quickly.
A. at                        B. to                        C. about                        D. on