71. be/get + used to doing sth. 习惯做某事     

My father is used to getting up early.  我爸爸习惯早起。

72. be worth doing  值得做什么(“主动表被动”，不能用被动结构)

73. be(feel) afraid to do sth. 害怕做某事 

    be afraid of sth. 害怕某物     

    be afraid that 从句     

74. because+句子 

    because of +短语 

eg : He was late because he had a headache  He was late because of his headache 

75. begin to do = start to do 开始做某事

    start…with…=begin…with… 以什么开始什么