--David has been away for more than 25 days． --I miss him very much．You know，25 days      short．            

All of my teachers but the math teacher ______ he cheated in the exam.

The number of people invited _____ fifty, but a number of them ____ absent for different reasons. 

The students in our school expected ______ more time for reviews and exercises before the College Entrance Examination next year.

下列字母中含有相同音素的是　　　　。