Nicolaus Copernicus’ discovery about the universe is ______, which ______later achievements in astronomy science.

 We the Chinese are not to be ______, ________the situation is.

 People should be cautious ______their personal information when surfing the Internet so as to prevent certain computer viruses ______ it.

The local police were______ by their authorities to _____ the situation as soon as possible.

 Only when people have enough to eat and plenty to wear _______ to talk about environmental protection.

Through thorough investigation, Dr. John Snow was finally able to prove that the outbreak of Cholera _____ people’s drinking of polluted water.

 By careful observation and precise calculation,  Nicolaus Copernicus _____ that there is no one center in the universe and the sun is the center of the solar system.

 ______ the aids from the outside, the positive attitude of the disaster-stricken people _____ the key role in the reconstruction of their destroyed towns and villages.

It has been announced by our provincial government that another two medical teams will be sent to ______ the injured people in the severe earthquake.

 Samples of blood from Cholera infected patients have been sent to the blood center _______.