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。
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