______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．
| A．What, how | B．That, how | C．What, what a | D．That, what |
．However, in recent years, ___Three Gorges have come to be appreciated more for their natural beauty as ___ wonder of Nature．
| A．the; a | B．/; the | C．the; / | D．/; a |
--- It’s been a wonderful birthday Party．Thank you very much．
--- ___________．
| A．No, thanks | B．I’m glad to hear that |
| C．My pleasure | D．It’s OK |
________ in Tibet for ten years, he has been accustomed to the life and the climate there.
| A．He has worked | B．Having worked |
| C．He has been working | D．Working |
30. Look! What a mess the room is! In my opinion, it needs ______.
| A．cleaning up | B．being cleaned up | C．to clean up | D．clean up |
--- Don’t waste any paper, because our forests ____ every day.
----Sorry, I didn’t know that.
| A．decreased | B．had decreased | C．have decreased | D．are decreasing |