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 （ ）一座土楼就是一座微缩的城堡，________，而强化了“从此他乡即故乡”的住下意识。①不是为了对付外来的打击，还能是什么②逐渐淡化了“山一程，水一程”的路上意识③然而土楼的基本功能还是生活④从中原辗转而来的客家先民，便是通过建筑土楼⑤而且还容纳了生活的方方面面⑥高耸的敌台、四望的枪眼

Could I have a window seat —All right. Your flight _____ boarding atGate 18 at 2:15.

We have black shoes only $28.

urn to the problem of water pollution , I’d like you to look at a study _______ in Australia in 2012.

Our government has decided to set up ______ more hospitals and schools in Jiangbei New District of Nanjing.—I’m very glad to hear that.