21．-----How good the news is for you!
------ ______________．
A. You are friendly to tell me B. I'm glad to see that
C. It's kind of you to say so D. It's nice to hear from you
22．______ most efficient way to understand thousands of new words is to gain _______ good knowledge of basic word formation．
A. A；a B. The；/ C. A；/ D. The；the
