21．—Alex has lost his job.
—________? As far as I know, he is devoted to his work.
A. What for B. So what C. How’s that D. How come
21．When chatting with a stranger on the Internet, bear in mind______ he could be anybody, for you can’t see him _________.
A. that; in particular B. that; in person C. what; in detail D. \ ; in public
21．—You must apologize to Rebecca for being so rude, Sam.
—Why ________ I say sorry? It’s she ________ said insulting words first.
A. should; who B. must; whom C. can; that D. will; who
21．All parents are willing to risk ________ their lives to save ________ of their children when a disaster is approaching.
A. losing; that B. to lose; those C. losing; those D. having lost; the ones
21．________ people are concerned about now is the Shanghai World Expo, which ________ start on May 1st.
A. What; is due to B. Which; is going to
C. That; is to D. What; is about to
21．It ________ me that I could buy the admission ticket of the exhibition at the discount of 50% with my student card, ________ made me extremely excited.
A. happened to; that B. occurred to; it
C. happened to; which D. occurred to; which
