It’s important for us English well.

Was it at five o’clock ______the fire broke out？

(南京市2008—2009学年度第一学期期末调研测试卷)The financial crisis and the suffering ______ has caused have a great influence on the whole world

The manager of the hotel requests that their guests______ after 12:00 pm

He said that doing part-time jobs did no good to students, but few _____ his view.