They often discussed the theory while __11__ outside or sitting together in the room. They __12__ did that in their letters when one of them was __13__ from home.

　　In 1914, the Einsteins moved to Berlin and __14__ down there. At that time, Einstein's theory __15__ to be correct and he became __16__ all over the world.

　　Marits was very __17__ her husband with his success. But it was not long __18__ the First World War __19__. Marits as well as her two sons, who were __20__ holiday in Switzerland, couldn't come back to Berlin any longer. The war not only stopped Einstein's work but also broke up the warm, happy family. In 1919, Einstein and Marits had to get divorced (离婚)．

　　1．A.pairs　　　　　　　　 B．couples

　　C．friends D．classmates

　　解析：选C　由空前句意"......对于物理方面同样的兴趣使得他们两个人走到一起"以及下文"不久，他们相爱了"可知，他们成为了好朋友。

　　2．A.got B．fell

　　C．became D．turned

　　解析：选B　fall in love with sb.的意思是"爱上某人"，其他三个动词不与in love with连用。

　　3．A.marrying B．marries

　　C．married D．married with

　　解析：选C　表示"和某人结婚"，应用marry sb.，marry后不加介词with，排除D项；由空前的时间状语从句可知，此处应是主句的谓语动词，排除A项。又因本文的时态是过去时，排除B项。故选C。

　　4．A.Since B．For

　　C．With D．After

　　解析：选D　after their marriage意为"他们结婚以后"。

　　5．A.gave B．offered

　　C．forced D．devoted

　　解析：选D　devote oneself to sth.的意思是"投身于某事"。give, offer和force都不与oneself to sth.搭配。

　　6．A.Giving B．To give

C．Given D．To have given