Not until I began to work ________ how much time I had wasted.

nteering is becoming popularin China .——yeah, people are now aware that helping others is helpingthemselves.

lcano erupted violently , yetthe village at the foot of it should _________

For kids, I think two hours of playing computer games ______ too long.

Have you finished all your homework? — Of courseI ________ it before I went out to play football