China's national observatory on Monday issued a yellow alert for sandstorms in the northern part of the country. “    1    （start）from Monday to 8 a. m. Tuesday, affected by cold fronts and heavy winds, floating sand and dust       2    （expect）to sweep parts of several northern provinces and the city of Beijing,”     3    （forecast）the NMC.

Some regions in Inner Mongolia, Ningxia, Shaanxi and Shanxi were hit by strong sandstorms. The capital Beijing was enveloped in yellow dust     4     Monday morning with visibility at less than 1 km,     5     followed an official yellow warning for the sandstorm. The sandstorm is the strongest and the most sweeping     6     in nearly a decade. Remote sensing images of dust in northern China show the dust from Mongolia     7    （gradual）traveled south with the airflow.

This wave of sandstorms is a result of the combined       8    （effect）of cold air and cyclones from Mongolia. “The combined action of the Mongolian cyclone and the cold high     9    （press）provided a strong impetus（动力）for the sandstorm,” said Zhang Bihui,     10     senior engineer with the NMC.

Suzhou is a cultural and historical city in China’s Jiangsu Province. It is celebrated all over the world for its classical gardens    1    have been added to the list of World Heritage Sites. They were first laid out as far back as the 6th century BC and    2     (reach) their top during the period from the 16th century to the 18th   century. Records show that there were over 200 gardens during their golden age. The gardens show the importance of natural    3     (beautiful) in Chinese culture.

Today, dozens of classical gardens are still in good condition,           4     (include) the Humble Administrator’s Garden, which    5     (have) an area of some 52, 000 square meters. No other gardens of Suzhou are    6     (large) than it. It was originally the dwelling of Lu Guimeng, a poet of the Tang Dynasty.     7     (consider) as “the mother of all gardens under the sun”, the garden    8     (divide) into the eastern, central, western and residential parts. The gardens of Suzhou are    9     (extreme) beautiful and a feast for the senses, used as both tourist attractions    10    residential houses.