Attention, please. All of you students _______ remain in their seats until all the papers have been collected.

Without your help,we       this task.

--Where have you been? --I_____in the heavy traffic. Otherwise I_____ here earlier.

It is a good example of a site that many people think _____ to change.

.—You ____ have set aside more time to play with our kids.—I wish I ______, but you know how busy I was.