下列加点词的用法不同其它三项的是：

feel all the training a waste of time, but I’m a hundred percent sure later you’ll be grateful you did it.

He has his faults, but _________he is a good student.

Thousands and thousands of people attended the president’s inaugural ceremony, with ages ___ from 5to 100. [ ]

I told you that you shouldn’t waste your time playing the computer games,_____________?