________the programme，they have to stay there for another two weeks．
| A．Not completing | B．Not completed |
| C．Not having completed | D．Having not completed |
We must show concern ____ each other.
| A．with | B．for | C．at | D．to |
I ____ too much reading.
| A．am tiring | B．tired out because of | C．am tired out in | D．tired myself out with |
We hope that she will ____ soon.
| A．returns back | B．reach to home | C．reach for | D．pull through |
If we can keep ____ this speed, we'll arrive there in two or three hours.
| A．on | B．to | C．up | D．at |
The Great Wall was built to keep ____ the invaders.
| A．in | B．out | C．up | D．off |