____ Since he fell off the bike, John _____________（stay） in bed for a week．
____ ——What is his plan after leaving school?——He _______________（go） to Beijing for education．
____ Could you please ________________（not speak） so loud?
____ David preferred __________（sell） newspapers to doing housework when he was young．
____ The teacher has finished ________________（interview） the parents．
____ You _________________（not laugh） at disabled people．It's impolite．
____ If I ________（be） you, I would help the homeless people．
____ You should say “Thank you” when you ________（give） something as a present by your friends．
____—— I called you yesterday night, but you were not at home．——I ____________（drive） home on the way at that time．
____ Young children should __________（allow） to choose their own clothes．

从东、西半球看，我国位于西半球；从南、北半球看，我国位于北半球。

19世纪末20世纪初形成的三国同盟和三国协约的核心国家分别是(     )