21. They areinteresting books.
A. an B. a C. \ D. one
22. —are the socks?
—They are 80 yuan.
A. How old B. What price C. Where D. How much
23. —David and Jane like action movies?
—Yes,.
A. Do, he does B Do, they do C. Does, he does D. Do, they don't
24. —Happy birthday!
—.
A. Very good B. Happy birthday C. Thank very much D. Thanks