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If you ask people what they think of graffiti, many say that they consider (51)______ vandalism, but some actually appreciate the images or words sprayed on walls and think of it as an art form. Interestingly, wall painting (52) ________in various forms for about the last 40,000 years. (53)________ prehistoric times, humans used to paint images of wild animals or people on the walls and ceilings of caves. There are many theories about the reasons for creating these images, but (54)_________ knows for sure. Evidence shows that they were not just used to decorate the living areas, as most of the caves (55)_________ inhabited at the time when the paintings were created. Many experts believe that cave paintings (56) _______ a way of communicating with others.

Although today street art rarely features in art exhibitions, (57)________ of art in public places remain popular with artists all over the world. Whether they use chalk drawings, street sculptures, or graffiti, street artists use the streets as their gallery to communicate (58)______ the public more directly. There are even (59)_________ walls around the world where graffiti is encouraged. For example, the famous John Lennon Wall in Prague in the Czech Republic, (60)________was filled with graffiti featuring lyrics from the Beatles' songs. It was popular for over two decades until the wall was painted over with a single colour in 2000.

Question 51. A. as if                           B. it to be                                 C. like as                      D. it like

Question 52. A. has existed                 B. had existed                           C. existed                     D. exist

Question 53. A. While                         B. Since                                   C. From                        D. During

Question 54. A. somebody                  B. everybody                            C. nobody                     D. anybody

Question 55. A. aren’t                         B. haven’t been                        C. hadn’t been              D. weren’t

Question 56. A. must be                     B. might had been                    C. may have been            D. could have

Question 57. A. work                          B. works                                   C. goods                       D. makes

Question 58. A. by                              B. to                                         C. on                            D. with

Question 59. A. few                            B. a few                                   C. little                         D. a little

Question 60. A. which                        B. where                                  C. when                       D. whom