direction : choose the most appropriate topic of a paragraph
1 choose the best main idea sentence
cat and dogs are both popular pets. but cats are nicer pets in some ways. cats are cleaner, first of all. they stay very clean and they do not make the house dirty. cats are also quieter than dogs. they usually do not make a lot of noise. cats are safer, too. dogs sometimes bite people, and finally cats are easier to take care of.