1. Would you please tell me_______ G-20 Summit in London is all about?

   A. that which       B. what that                    C. that                     D. what

2. I am sorry. I didn’t _______ your voice ______ the phone.

   A. recognize; in     B. know; on                    C. recognize; on          D. made out; over

3. Only after this financial crisis has come to an end, ________ to come back to work.

   A. will you be able                                 B. are you able        

C. you will be able to                              D. you are able to