1,
include包括；包含
Price $14.90,postage included.
价格14.90美元,邮资包括在内.
He had included a large number of funny stories in the speech.
他在讲话中加进了许多引人发笑的故事.
The United kingdom includes Northern Ireland and Wales.
联合王国包括北爱尔兰和威尔士.
contain 包含；容纳；装有
Beer contains alcohol.
啤酒含有酒精.
The speech contained some interesting ideas.
这个讲演包括一些有趣的思想.
How big is the angle contained by these 2 sides?
这个两边的夹角是多大?
简单来说,include表示包括一类东西,而contain表示其中有什么东西
2,see sb.do sth.看见某人做某事
see sb.doing sth.看见某人正在做某事
如：I see him smoke 我看到他抽烟,强调看到他抽烟的全过程,有可能包括掏出烟,点烟等动作.
I see him smoking 我当时看到他抽烟了.强调的只是抽烟这个动作被你看到而且是正在进行的.
sb be seen to do sth 某人被见到做某事
3,我觉得应该用spreaded,如果不对,我也说不清楚,你可以去问问你的老师