giúp em với ạ giải thích nữa ạ (em đang cần)
51. Many people with serious visual impairments can travel independently ____ is considered to be the international symbol of blindness.
a. by using a cane, which     b. by using a cane, that      c. by being used a cane      d. by used a cane, which
52. Designers have developed a number of tools ____.
a. for the used by the blind people    b. for used to by blind people
c. are used for blind people               d. for the use of blind people
53. Mother Theresa devoted ____.
a. her life and helped poor            b. her life to helping the poor
c. her help and life of the poor      d. to help poor
54. You are the first person ____ I am funny.
a. to tell me       b. telling me that          c. who telling me          d. that tells me to be
55. Children __ have always been part of our communities.
a. Disabled       b. Disabilities          c. which are disabled            d. with disabilities
56. Special Education includes school-based activities __ family and community activities.
a. as well as     b. as long as           c. both       d. Neither
57. The earlier special education was provided, ____ the outcome for the child and the family. 
a. best            b. the best          c. the better             d. the good
58. Special Education ____ a different quality in different countries. 
a. has    b. has to       c. that have        d. which has
59. The fact that he was not offered the position ____.
a. which made him very upset          b. made him very upset       c. that made him very upset  d. making him being upset
60. Mrs. Pike ____ very attractive when she was young, but now she looks pale because of the illness.
a. is used to being            b. used to be            c. was used for being      d. use to be