It have been continue 2 days, I shouted to the 2 class's students. Now, I am wondering "did I make the right choose be a teacher?" 
really not that easy to teach here, special need to face so many class and students level are not the same.
第一年本來就不容易，再加上你的班很多。加油！撐過去，你就走過去了。有什麼問題提出來大家會給你點子。 
對學生盡量不要提高音量，想想看用別的方式。他們會試你的limit,一直提高音量不是辦法。
每件事情, 開頭都難.