With economy developing at great speed, our city has ________ quite a few changes in recent years.

(2013·江西十所重点中学模拟)—I really admire the people full of ______.I'm always tired.—You'd better take more exercise.

After a long discussion about the advantages and disadvantages of the plan, they finally came to a(n) ________that it was practical.

Beijing has struggled with smog for years，which has__________ the sun and affected the health and quality of life of millions.

The Chinese University of Hong Kong, founded in 1963, ____ 50 in 2013．