英语问题：是be excited at 对还是be excited about 对？要求快一点啊

都可以用。但有区别：
1.Be excited at..主要指地点,场景,位置.
Foreigners got excited at Beijing Olympics' opening ceremony. 老外在北京奥开幕式中老激动了.

2.Be excited about 对...感到兴奋,激动
Why should we be excited about the 2008 Olympics/the 2010 World Cup?
I was excited about a job interview. 我对那个面试老激动了,当时.

hen will your teacher arrive/reach/get 都可以用吧，不过要看具体的句子。

be excited about

arrive