单词拼写。根据下面的汉语提示，写出所缺单词的正确形式，每空一词。

1. Manatees eat about 100 ______ (英磅) a day.                             

2. ______ (等) for her made me angry.                                         

3. Last Sunday, two kids ______ (拜访) me.                                  

4. I'm more ______ (外向的) than my sister.                                   

5. He didn't know what was ______ (发生) outside.                        

等待航线的每层之间的高度间隔为（）英尺。

A.1500

B.1200

C.1000

D.80000