Notice the repeated use of commonly used words in the paragraph below. use a thesaurus to improve the maturity of the writing by replacing five words in bold. rewrite the paragraphs. use proper spelling and grammar. pet ownership can be fun, but it can also be a big responsibility. with each type of pet comes a different responsibility. some pets have fun while taking walks, while others like swimming in water. if you understand your pet, you can have fun for many years to come.