I won’tleave the classroom until my homework .

His aunt’s lettershim of those beautiful days when they used to live together in his hometown.

－Whydid you have to get that stamp It’s far from beautiful－________mycollection，ofcourse

I lost my watch. I must ______ it.

Mr. Wang would have continued to lead _____ poor life instead of changing his lifestyle if he hadn’t met Mr. Smith by _____ chance who was a businessman.