1 是bring in a low还是bring out a low? 2 given more caring and love,he would not have become like this. given为什么不用had been given?这个动作应该是放生在主句之前啊,难道虚拟语气特殊用法? 3 the bird tried to fly in the same direction as (that) taken by its outdoor cousins.括号里的that应该如何理解? 4 the stars are apparently their important —— of navigation A means B objects 答案是A但是为什么objects不可以? 5 what do they do when the stars are—— by clouds? A hidden B covered 答案是A,但是我觉得hide应该是云主动去藏但是这里只是单纯一种自然现象啊,B不妥在哪里? 问几个实在的问题。。