-Who are you waiting for?-___________ us a lecture this afternoon.
—I hope the result of the exams had not been told to us.—________,why did you come here to see our teacher?
Which material can be thrown into the sea ________ on the nature of the material?
He’s got himself into a dangerous situation he is likely to be accused of meeting someone.
Many journalists were sent to ________ the terrible disaster immediately the earthquake broke out in Sichuan Province on May 12th,2008.
I guess we’ve already talked about this before but I’ll ask you again just __________.