翻译
77. The beauty of the West Lake in Hangzhou is_____________________ (我无法用言语来描述).
78. Last week, Tom and his friends celebrated his twentieth birthday, ______________(尽情地唱歌跳舞).
79. Why is she looking at me______________(像是她认识我似的)? I’ve never seen her before in my life.
80. Mr. Johnson made full preparation for the experiment______________ (以便实验能顺利进行).
81. I avoided mentioning the sensitive subject lest_____________________ (触犯他).
答案：
77. more than I can describe in words/beyond words
78. singing and dancing to their heart’s content.
79. as if she knew me
80. so that it could be conducted smoothly
81. he be offended/annoyed
