Once the problem _________，all other problems will be solved.
| A．has solved | B．was solved |
| C．is solved | D．will be solved |
207. After a few days’ hard work, the workers have broken the neck of the project. The underlined part probably means _____.
| A．the workers have damaged the project |
| B．the workers have delayed the project |
| C．the workers have got rid of the project |
| D．the workers have finished the most difficult part of the project. |
206. My cousin is a sailor. He's doing very well in the _______.
| A．army | B．navy | C．air force | D．Boat |
205. There are 56 ___________ in China all together and they get on well with each other in our socialist big family.
| A．nations | B．races | C．nationalities | D．People |
204. The railways in China belong to ______, whereas the ones in Japan, to the private..
| A．the nation | B．the country | C．the state | D．the land |
203. Hawks eat more field _____ than _____ . We should take good care of them and not kill them
| A．mouse… Chicken | B．mice… chicken | C．mouse… Chickens | D．mice… Chickens |