几句英文,帮我看看有没有哪里需要改

1 Last but not the least ,adequate supply is always necessary.(没有the,required不地道）
2 Avoid suppliers whose countries have no political stability or trade barriers to the target products.（句子成分拖沓啰嗦,instability改为no stability比较地道一点,country 改为复数）
3Because if the supply was cut off ,the company would forced to be discontinued.And the losses caused by it would beyond compute.(从句中is改为was,虚拟语气应用动词的过去式)
4All in all,the 3factors mentioned above are the keys to deciding which supplier is the most
suitable for the company.(句子缺成分,我加了the most suitable,be the key to doing固定搭配)
其他单独的就没问题了,但你要是想把这几个句子当成一篇文章的话还存在逻辑问题.