21.Ding Junhui,_______ most famous snooker player, is _______quiet young man.
A. 不填，a B. the; 不填 C a; a D. a; the
22. —Can I help you, sir?
—These shoes are too ______ and I need a bigger pair.
A. loose B. delicate C. exotic D. tight
23. —I heard that Mr. Smith has become a triathlete.
—Oh, really? He has become ______ he wanted to be.
A. who B. which C. what D. that
