I think, in the comtemporary sociaty, gender roles don't mean much, except the differences caused by physical abilities we are born with. = I think, in contemporary society, gender roles don't mean much, except for the differences caused by the physical abilities we are born with.
In the law, we can't hire employees base on gender,and shouldn't distinguish. = By law, we can't hire employees based on gender, and we shouldn't make distinctions. we can't define the roles base on gender officially. = We can't define roles based on gender officially.
There are still many people thinking the gerder roles are necessary, but the stereotype about gender role has changed a lot compare to past. = There are still many people who think gender roles are necessary, but the stereotypes about gender roles have changed a lot compared to the past.

I hope you do well on your test. : )
Good luck!

Teacher’s Comment:
You expressed your ideas clearly and thoughtfully, Sean! Great job using comparison and critical thinking. Just be mindful of your spelling (like "society") and article usage (such as "the" and "for"). Keep up the good work—and thank you for wishing me well on my exams. I think I did well haha.