When Mr Green got to the entrance of the hall,he saw some ki

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When Mr Green got to the entrance of the hall,he saw some kids ____ there.
smoke,为什么不用smoking,请解析.
The problem is _____ difficlt for us____.
a.so;work out b.very too;to be worked out c.rather too;to work out d.quite too;to work it out
请问为什么?
在此先谢了.
Don't write ___ your pencil .Please write ____ pen.
a.with;with b.with;in
为什么？

第一题答案错了,不存在see sb. to do sth.的形式,see sb. do sth中的do是不带to的动词不定式,不应该用过去式或者其他形式的.类似的还有:watch sb do sth,let/make/have sb do sth,在英语中有10个半动词可以跟不带to 动词不定式,即所谓一感、二听、三让、四看、半帮助.而see sb.doing sth.是表示看见某人正在做某事.
第二题,sth. is difficult for sb. to do,某事对某人来说太难了,根据这一点可以排除A、B（to work out 本身已经表达了被解决的含义,不需要再用Be动词在此了）D（work it out,在此加上it属于画蛇添足,不符合英文习惯）,这样剩下的C,rather表示稍微.

When Mr Green got to the entrance of the hall,he saw some ki I saw an old man ___ in the entrance hall when I came to the he was（） when he saw some green light in the sky When I met her at the entrance to the hall,she_________to me Mr Green has got u_ to the lifestyle here since he came to C I saw Mr.Green (get out of)the car. Tom got _____ when he saw the _____ book. How far does Mr Green when he comes to the Sun Hotel at last Mr Chen has moved out of the town when he got married at the entrance of at the entrance to区别何在? the entrance to 与the entrance of 区别? Once Mr.Black went to a big city on business.When he got the