65. by air mail 寄航空邮件
64. break into "闯入, 破门而入"
63. belong to 属于
62. because of 由于
61. be worried about 为……而担心
60. be used to 习惯于
59. be thankful to sb. 对某人很感激
58. be surprised at 对…...感到惊奇
57. be ready for 为……作准备
56. be proud of 为……而感到自豪