高中英语完型得空不懂,1.my memories（minds) raced back more than thirty

高中英语完型得空不懂,
1.my memories（minds) raced back more than thirty years to the darkdays of 1941.为什么不可以用minds,我的思绪回到了1941年
2.sharing（suffering） wartime problems,we shelter-dwellers got to know each other very well.（同样遭受战争,所以我们互相了解,不行吗）
3.His mother told me he was 37 then,but he had less (worse) of a mind than a baby
has.(worse不行吗?比一个baby的智商还要差）