Einstein’snewtheoryonopticschanged__________scientificideaaboutlight.
必要的;基本的adj.要素，要点n.e_______________
Allofmyeffortsto__________peacefailed.
交易;事务;处理n.t_______________
Thetimehascomeforthecompanyto__________afteryearsofrapidexpansion.
口令;密码n.p_______________