. —Li Hua was in London for two years.   —It’s no ___ he can speak English so well.

Some countries are increasing their use of natural gas, and other forms of ______. 

The doctor finally gave up the ____ of medicine for full - time writing．

_____ the different cultures, values and levels of economic development in China and the West, both sides should respect the diversity of their development paths.

—Yangyang carried off the first winter Olympic _____ medal for China.—Great! What ____ she won for our motherland!