是bring in a low还是bring out a low? 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? 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? 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? 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。。