________“Beijing Olympics”in a search engine and the medal table will appear at the top of your screen．

1. A.
   To look up
2. B.
   Looking up
3. C.
   Look up
4. D.
   Looked up

________ “Beijing Olympics” in a search engine and the medal table will appear at the top of your screen.

A．To look up           B．Looking up          C．Look up           D．Looked up