阅读理解，填写单词所缺字母。
（1）A good teacher m__st collect some questions from the students b__fore his class.
（2）A good student sh__ __ld ask and answ__r a lot of questions in the class.
（3）We alw__ys go to school e__rly from Monday to Friday.
（4）We d__d not hear the music of mobile phone j__st now.