“All     is necessary for the triumph of the evil is     good men do nothing．” Edmund Burke said．

The reason ______ he gave for not coming was ______ his mother wouldn’t allow him to.

He is the only man ______ I can find for the work.

 While playing ping-pong, our eyes see the ball coming, judge its speed and then hit it back ________ it should go. 

All ___ can be done has been done.