We don’t know who ____ for the murder, but the policemen will tell us the truth soon.
| A．is to blame | B．is to be blamed |
| C．is blaming | D．is to be blaming |
The two sportsmen congratulated each other __________ winning the match by shaking hands.
| A．with |
| B．on |
| C．in |
| D．to |
The development of the city's industry __________ its environment pollution.
| A．has added up |
| B．has added to |
| C．has added up to |
| D．was added to |
He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.
| A．on；at |
| B．on；out |
| C．at；up |
| D．for；out |
The energy Jenny Bowen has devoted in the past ten years __________ the orphans has been considered __________ of great help.
| A．to help ； being |
| B．to helping；to be |
| C．to help ； to be |
| D．helping; being |
The __________ on his face told me that he was angry.
| A．impression |
| B．sight |
| C．appearance |
| D．expression |