Only when I got here _________ that I had made a big mistake.

a, __________ the alarm clock for 6 o’clock, oryou will oversleep and be late for the train.

It was March 11, 2011 _______ magnitude-9.0 earthquake struck Japan and subsequent tsunami triggered the large-scale crisis.

He﹍﹍the job well, but heso careless.

Though he doesn’t achieve his goals, he is not a failure．___, he is remembered as a true hero．