First, you need to say: "Please check my essay." If I would have your essay checked that means I would get somebody else to do it.

Originally Posted by
Raiph Since the first cloning sheep,Dolly was born, people aroung the world have never stopped focusing on cloning .
Perhaps:Since the first cloned sheep, Dolly, was born, people have been talking about cloning with great interest.
You have problems with punctuation. For example, space after every period.

Originally Posted by
Raiph Some people are stronglu opposed to human cloning , the claimed that it goes against the law of nature and it is a sin.
Try:Some people are strongly opposed to human cloning. They claim it goes against the law of nature and is a sin.
Perhaps others will have additional comments.
~R