请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项,并在答题卡上将该项涂黑。
21. —What do you think of the idea of Web TV?
--Web TV is a world of interactive TV programming, ______ anything wonderful can happen.
A. the world which B. the world where
C. a world which D. a world where
22. ______ with modern facilities, the lab is intended to seat more than 2000 students, _____ excites all of them.
A. Equipped; that B. Having equipped; that
C. Equipping; as D. Equipped; which
23. —Oh, how depressed! I’m bound to lose to him in tomorrow’s competition．
--Cheer up！In fact，he is ________ than you．
