After Ya’an earthquake the school practiced an emergency drill showing the children how to         find their “safe place”____. 

He didn’t work hard;       he was dismissed by the boss.

He could have finished it on schedule, but ________ he fell behind.

At first the institute refused to purchase(购买)  the  experiment  instrument,  but  this decision was ______ changed.

It is believed that high achievers work toward personal standards of excellence ______ material rewards.