Had I known about this computer program, a huge amount of time and energy .

依次填入下面一段文字横线处的语句，衔接最恰当的一组是( )原来这董超、薛霸自从开封府做公人， ① ，回来被高太尉寻事，刺配北京。梁中书因见他两个能干，就留在留守司勾当。 ② 。

55 The rock is _____ two hundred _____, and almost no one can move it

I can’t play the guitar ____ the violin, and he can’t play them, .

People in Sri Lanka _________ a hard time when the tsunami struck the country last year.