语法填空,阅读下面材料，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
Nicolaus Copernicus was born in a wealthy family in 1473 in Poland. In 1496, he went to Italy where he      (study) law and medicine and so on until he came back to his homeland in 1506. He later worked for the church till he died in 1543. Copernicus lived in a time     people still believed everything moved around the earth in     universe. But through his years of     (observe) and mathematical calculations, Copernicus became confused because he found the earth was not the centre of the solar system. He kept improving his new theory until he felt it was complete in 1514. He suggested that the earth    (spin) while going round the sun. His friends were enthusiastic and encouraged     to publish his ideas, but Copernicus was cautious. He didn’t want       (attack) by Christian Church. Finally, as he lay dying in 1543, he put    the theory that the sun, not the earth, is the centre of the solar system.
Copernicus has set a good example to us, sticking to the     (science) truth and bravely breaking away      the old view.