Mid﹣Autumn Festival is a special time for families and it is on the 15th day of the eighth lunar month.
The official language of China is Putonghua， the foreigners usually call it Mandarin.
He who has not climbed Great Wall is not a true man.
People around the world are working on （reduce） the causes of global warming.
At the very heart of Beijing，the Palace Museum is China's largest of all the ancient
（building）.