几个高中英语问题If we protect ourselves too much, then we stop growi

几个高中英语问题If we protect ourselves too much, then we stop growing. We become trapped/ creatures inside shells of our own making. 答案选了trapped,说如果选creatures不合语法.但我看不出选creatures怎么不合语法了?②grades和study 哪个与improve搭配比较好?为什么?③The computer will tell/ identify your fingerprints before it allows you to enter the building. 答案选tell,可是我选了identify.怎么区分这两个单词的使用?④Students nowadays should make full use of their time to equip themselves with knowledge so that they can easily suit to/ adapt to the competitive society in the future. 答案选了adapt to,我想知道suit to 为什么不行?两者有什么主要区别?⑤Taobao, an online shopping site, quickly began offering for/ on sale coats in the same style of the superstar's. 答案填for,我填了on.其实我感觉这两个都可以呀.