It's good for your eyes to the green trees for a minute or two.
A：look out of
B：look out at
C：look out from
D：look for at
He was ____ (homeless/homelessness), so we took him in.
弗兰西斯培根说：“这三种东西改变了整个世界的面貌和状态，第一种是在文字上，第二种是在战争上，第三种是在航海上。”这里的“第二种”指（ ）
用1，2，2，3能组成不同的四位数有____个．
加一笔，变新字
大____ 日____ 了____ 人____ 火____
