we all have many problems.We have to deal with them————----我觉得改成这样比较好耶 we all have many problems that we have to deal with .
we can smile at our life.---我觉得怪怪的 用can——should!
We know Stephen Hawking,a famous scientist.------There is a famous scientist called Stephen Hawking who has some physical problems.
However ,he never gave up so that he become successful in the end.
we can regard problems as challenges.这里也好像是can-should 比较好
（可是should太多又好像不太好）
you will feel differently and be happy.---------you will feel different and happier.(feel是系动词后面加adj可以的)
Don't be afaid of difficulties,because sometimes they can make us develop well.----Don't be afaid of difficulties!Because they can make us strong most of time.
Let's face all the problems we meet bravely and smile at our life.
我英语也不是很好
只个人看法