Writing prompt: Keeping Pets

Student essay:
Nowadays,more and more people prefer to keep pets.
On the one hand,keeping pets has some benefits.First,it can bring happiness to the old and let the young learn how to become more responsible people.Second,it can help people know more about animals and take good care of animals.
On the other hand,there are also some troubles when we are keeping pets.Firstly,pets like dogs are always noisy and bark at strangers.If some pets are so naughty that make your things dirty and messy,you will be angry with them but you ca do nothing to them.Secondly,it will take additional cost to keep pets.What's more,it's possible to destroy the ecological balance.
In my opinion,pets can help people a lot.For example,guide dogs are the blind's eyes that lead to anywhere.However,I don't thing that it's a good idea to raise pets.When you go for a trip with your family,the pets won't be fed or looked after.

Corrected essay:
Nowadays, more and more people prefer to keep pets.
On the one hand, keeping pets has some benefits. First, it can bring happiness to the old and let the young learn how to become more responsible people. Second, it can help people know more about animals and take good care of them.
On the other hand, there are also some troubles when we are keeping pets. Firstly, pets like dogs are always noisy and bark at strangers. If some pets are so naughty that they make your things dirty and messy, you will be angry with them but can do nothing to them. Secondly, it will take additional costs to keep pets. What's more, it's possible to destroy the ecological balance.
In my opinion, pets can help people a lot. For example, guide dogs are the blind's eyes that lead them anywhere. However, I don't think that it's a good idea to raise pets. When you go on a trip with your family, the pets won't be fed or looked after.