Obesity is a problem very difficult to get rid of because of all the junk they put in our food, obesity can cause heart problems and the heart is very important to the body
The first choice is correct because the second choice is a fragment, and the third is an incomplete thought. Also a fragment I guess.
As a parent, your focused on keeping your little one safe. Supervision and safety precautions, such as gates and electrical outlets covers, are important. But you also want to offer your child chances to explore the outside world. The means close to supervision, but with changes to enjoy the different environment. Therefore I agree to allow your children to explore under supervision.
I love to write papers. I would write one everyday if I had the time.
Or in one sentence:
I love to write papers and I would write one everyday if I had the time.
