________ about our physical and mental health, our class advisor suggested us taking more exercise and having enough sleep．

A．Concerning

B．To be concerned

C．Concerned

D．Having concerned

Wind power is an ancient source of energy ________ we may return in the near future．

A．from which

B．to which

C．on which

D．by which

According to some local old men, the Earth Buildings of Yongding ________ the 1800s．

A．are dated back to

B．date back to

C．were dated back to

D．dated back to

The earthquake ________ Japan on March 11 was so strong that it caused many deaths and losses．

A．to attack

B．attacked

C．being attacked

D．attacking

China's growing presence on the world stage has also ________ a much wider recognition of Chinese business practices．

A．applied for

B．resulted from

C．contributed to

D．brought up

Several new laws and regulations have been in force since May 1st．As a driver, I shall ________ the traffic rules and not drive after drinking．

A．observe

B．seek

C．approve

D．perform

On April 24^th, 2011, Hu Jintao, ________ chairman of the P．R．C, and other state leaders attended Tsinghua centennial(百年的)celebration at ________ Great Hall of the People in Beijing．

A．/;/

B．/;the

C．the; the

D．the; /

Women’s earnings are well below men’s, _________ educational difference that are decreasing between the two sexes．

A．in favor of

B．in case of

C．in spite of

D．in terms of

Low-carbon life is of great benefit to improve the world environment．_________ can be enjoyed from it until you have a deep understanding of it, though．

A．something

B．Nothing

C．Few

D．Much

Look out! Don’t get too close to the house _________ the roof is under repair．

A．whose

B．which

C．of which

D．what