Questions 27 to 31 are based on the following passage． It is universally known that friendship is one of the ever—going themes in the literature of all languages．This is because human beings were born to need the warmth and respect from friends．Indeed，people，old and young，male and female，at work or at leisure， unsurprisingly or unexpectedly，are meeting new people and making new friends every day．However，it is impossible for US to make friends with everybody．We have to choose true friends．Some of US like similar friends，while others different friends．Personally，I prefer both． It goes without saying that having similar friends has many advantages．We can feel a sense of strength when we have a group of old friends who share our suffering and happiness．Naturally，anybody with an ambition in life，either to become an artist or all engineer or a politician，will feel a special need to be surrounded by friends whose assistance and encouragement will add to his confidence．Moreover，old friends always know how to maintain trust．I am always delighted when I meet an old friend after a long departure．Immediately，hearty laughter fills the atmosphere． However，I believe that a mixture of friends is equally advantageous．In the first place，frequent contact with different friends broadens my world outlook．For instance，during my stay abroad，I found it a real treasure to have foreign friends who often helped me strengthen my beliefs that I had made at home．Secondly．I find that different friends Can not only lead to new adventures and new career opportunities，but also show me new things in life，which would otherwise be impossible with merely similar friends．Thirdly，they can help me with whatever difficulties I meet with in life．They fire indeed my friends in need． To conclude．I prefer to have both types of friends and as many as possible．Of coarse，I will not forget to choose friends wisely． According to the last paragraph，when we choose friends，we should be（）．