I.用所给单词的适当形式填空
【小题1】The __________（discover）of X-ray made it easier to check and treat patients.
【小题2】English is __________（wide）used in many fields.
【小题3】He was very happy because of acting __________（success）in the film.
【小题4】UFO is short for __________（know）Flying Object.
【小题5】Many scientists have done a lot for __________（human）to live better.
【小题6】With the __________（develop）of modern medical technology，many diseases can be cured.
【小题7】Mandela made a great __________（contribute）to the equal rights of black people.
【小题8】Lots of __________（produce）have been sold to foreign countries.
【小题9】Many children in Africa are dying because of __________（hungry）.
【小题10】The whole world is amazed at the __________（achieve）that China has made these years.