Giving small children some money as a gift during the Spring Festival is a common ______ in China, which may seem strange to foreigners?

To keep fit, you should take more______ . Don’t be always busy doing your ______.

For sustainable development, the government has decided to give __________ to those energy conserving and environmental-- friendly business in many aspects.

       He told me that she had met one of my old friends in the street ________.

.The traffic slowed down because of the heavy snow in Yushu county, presenting a new __________ to the recovery from the earthquake.