Before leaving home, make sure to turn off the electricity, lock the door, ________ the windows open.
Play, often seen as____activity for kids, is still important in_________development of teenagers.
Low-carbon lifestyle is of great benefit to improve the world environment. can be enjoyed from it until you have a deep understanding of it,however.
The scientist was rewarded by the government for such a great,contribution to the country.
Too high house prices can be brought under control, the authorities introduce a series of regulatory policies.
all kinds of difficulties,the workers have made rapid progress in the construction of the World Expo 2010 Shanghai.