Simon plays football every Monday and Thursday, so he plays ______a week.    

He was so angry with his students that he could _____ say a word.

I can't see the words           .  on the blackboard. Please turn on the light.

We hope that with the help of the new skill, Liu Xiang can run _____ than before.

—Did you find the small village yesterday?—Yes，without any difficulty，for it has ________ changed over years.