21. —Are you going to take part in the English speech contest?
—_____? It is such a good chance to improve my spoken English.
A. So what B. Why not C. Why me D. How come
22. Jack is very stubborn and most of the time it is impossible to persuade him _____ his mind.
A. change B. changing C. to change D. having changed
23. Not knowing _____ Bill’s telephone number was, Betty had some difficulty
getting in touch with him.
A. which B. where C. that D. what
24. The famous star, _____ tries to make a comeback, has attracted a lot of attention.
A. that B. as C. which D. who
