He got well-prepared for the job interview, for he couldn’t risk the good opportunity________. 

The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.

 ---It is said that China will declare war on Japan soon. ---______, China will never be the first country______ weapons.

"We can not afford limited progress. We need rapid progress," Ban said at the Third World Climate Conference in Geneva,        by the World Meteorological Organization (WMO).

Though _______ abroad for years, many Chinese still ______ the traditional customs.