— The window must have taken you quite a lot of time that day.— You are right. They _____ for weeks. [ ]

want to book tickets for the 2012Olympic Games, just call 60952012 It _____be simpler

Mr. Bo _____ for half a month. He’ll come back in twomonths.

he newly-discovered star wasnamed _____ a Chinese astronomer ________his contributions to astronomy

He didn’t work hard, ________, he failed his exam.