With the of science and technology people can talk with each other much more convenie

问题补充：

--With the of science and technology, people can talk with each other much more conveniently than before.

--But China is still a country, people have to work hard to live a better life.

A. developed; developing;

B. development; developed

C. development; developing

D. developing; developed

答案：

A. developed; developing;

B. development; developed

(答案→)C. development; developing

D. developing; developed

解析：句意：随着科技的发展，人们可以比以前更方便地互相交流了。但是中国仍是一个发展中国家，人们必须努力工作来过上更好的生活。development发展，名词，developing发展中的，形容词，故选C。