我有一些不会的英语题,望各位大哥大姐帮助解决不下

Question

1).I stay with him for three hours last night helping him with his homework.
在这句话为什么用"helping"而不用"to help"?
2)There are many cars at this time of the day .So you must be careful crossing the road .
在第二句话中为什么用"careful"而不用"carefully"?"crossing"在此是什么词性,这句话怎么翻译?
3).He carefully balances the health casts of pollution against the expense of nuclear power and railways .
这句话怎么翻译?在这句话中用"against "对吗?
4)Yesterday ,I met Mr.Hunan and Mrss Liu in the supermarket. _____is the dean of our department and _____ my supervisor .
A)The former the latter B)Former latter
答案;B) 为什么不A)在这怎么不用the 呢?
5)"保进中西文化的交流"用英语怎么说?
6)"你找工作的时候你往往会看到这句话;有工作经验者优先."用英语怎么说?
7)"今天很多公司实现了数字化管理,因此没有受过高等教育的你是很难被公司录用的."用英语怎么说?

Answer 1

第一题：to do sth表示还没有做，doing 表示已经发生过的事 。帮助他做作业已经做过了 所以用doing
第2题： be是系动词 ，系动词后面用形容词 ，系动词还有feel，look等感观动词，carefully是副词 ，用在行为动词后面修饰行为动词。
第3题：他认真的衡量着因空气污染而带来的健康问题和制造核武器以及修铁路付出的代价。应该用against 因前后两者是对立的
第4题：当前面提到的人或物是以具体的名字出现时，后面再提到不用the ，或者是因为习惯问题，在说外语的国家，在日常生活中说话实际是不那么按语法，就像我们说汉语一样，有时不太遵守语法。（这个不太确定）
第5题：promote the communication of culture between east and west
6 ：experienced prefered

7：Nowdays,great number of companies take the conception of digitizing management,you have less chances to be hired if you have not received the high school education

Answer 2

to help肯是不可以的 (and)helping

be 后面接adjective而不是adverb 所以是careful
against用的对

我觉得答案应该是the former latter

boost the omnunications of culture between china and western

experienced prefered

Nowdays,great number of companies take the conception of digitizing management,you have less chances to be hired if you have not received the high school education