Ⅰ.用所给词的适当形式填空
　　1．When you get the paper back, pay special attention to what has been marked (mark)．
　　2．Great changes have taken place (take place) in my hometown since 2000.
　　3．When I reached the station, the tickets had already been sold(already sell) out.
　　4．In some parts of the world, such as in England, tea is served (serve) with milk and sugar.
　　5．As for the English Speaking Competition，when and where it will be held hasn't been decided (not decide) yet.
　　6．Every possible means has been tried (try) to stop the bad behavior, but they don't work at all.
　　7．Over the past ten years, this town has been hit (hit) twice by earthquakes.
　　8．-Will the lecture be held at 4 o'clock this afternoon?
　　-No.It has been put off (put off) till tomorrow afternoon.
　　Ⅱ.单项填空
　　1．All the preparations for the task ________， and we are ready to start.
　　A．completed         B．complete
　　C．had been completed       D．have been completed
　　解析：句意：所有的准备工作都已完成了，我们准备开始了。根据句意，应该用现在完成时