麻烦各位帮看看这片篇作文有什么语法错误或其他的问题？非常感谢！

" the life expectancy of average human beings "
把average 放到life 前面
研究某种现象用explore 的貌似不多
"result almost inevtiable in" result in 一般连在一起不拆开
only a few decades ago, it had cost innumberable 独立的句子间用句号
cost innumberable lives 用claim life 也许更好？没见过cost 这种用法。。。可能也可以？
On the other hand, although some diseases are still incurable at present, but
although 与 but 不可在一句中吧~
and joining health clubs 是join 你老用and呵呵~动词形式要保持一致
最后 你所有的reason后面都跟的due to ，换个that 或者什么别的 ，不然显得重复
或者这样格式整齐清楚也蛮好
（业余选手不敢多说~~）

" the life expectancy of average human beings "
把average 放到life 前面
研究某种现象用explore 的貌似不多
"result almost inevtiable in" result in 一般连在一起不拆开
only a few decades ago, it had cost innumberable 独立的句子间用句号
cost innumberable lives 用claim life 也许更好？没见过cost 这种用法。。。可能也可以？
On the other hand, although some diseases are still incurable at present, but
although 与 but 不可在一句中吧~
and joining health clubs 是join 你老用and呵呵~动词形式要保持一致
最后 你所有的reason后面都跟的due to ，换个that 或者什么别的 ，不然显得重复
或者这样格式整齐清楚也蛮好