根据所给提示，完成句子。每空一词，含缩略词。

75. Li Lin listens to English on the radio every day.（改为否定句）

   Li Lin __________ __________ to English on the radio every day.

76. Dave was making a model plane in the classroom at that time.（对划线部分提问）

   __________ __________ Dave making a model plane at that time?

77. Wang Bing was very glad to receive a letter from his old classmates.（改为同义句）

   Wang Bing was very glad to __________ __________ his old classmates.

78. 好好休息一下，你的眼睛会好很多。（完成译句）

   Your eyes will be much better after you __________ a good __________.

79. 有您这样的老师，我是多么的幸运啊！（完成译句）

   __________ __________ I am to have a teacher like you!