all kinds of difficulties,the workers have made rapid progress in the construction of the World Expo 2010 Shanghai.
Warmblooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
People have planted a great many trees in order to ________ wind and sand in the desert.
Traditionally, Chinese people _______ the Chinese characters Double Happiness and stick them onto walls or doors for weddings.
.People like taking photos because photos are the _______ of youth and history and can remind us of many happy scenes.
A much better way must be found to achieve an equal ________ of the resources.