It is vital that we _____ act out at once to protect the environment.
| A．would | B．should | C．will | D．can |
I have an appointment _______ Dr．Brown，but I need to change it．
| A．to | B．off | C．with | D．from |
— I’m sorry．I ________ at you the other day．
— Forget it．I was a bit out of control myself．
| A．shouldn’t shout |
| B．shouldn’t have shouted |
| C．mustn’t shout |
| D．mustn’t have shouted |
_____ with so much trouble，we failed to complete the task on time．
| A．Faced | B．Face |
| C．Facing | D．To face |
________ around the Water Cube，we were then taken to see the Bird’s Nest．
| A．Having shown | B．To be shown |
| C．Having been shown | D．To show |
I have ______ all the papers but I still can’t find my notes．
| A．looked for |
| B．looked through |
| C．looked after |
| D．looked out |