11.____ is well known to all, Hong Kong is often ________ “the Pearl in the East”.
A.As; known for                                    B.As ; referred to as
C.Which; referring to                                 D.Which; knowing as
12.I had great difficulty_____ the suitable food on the menu in that restaurant.
A. find                           B. found                C. to find                  D. finding
13.It makes no ________ to me whether he goes to the city or not. Anyhow, I will go.
A.thing                     B.difference            C.matter                          D.affair