Animal shelters take care of homeless dogs and cats.
Too general
Digital cameras are a common form of technologies these days
Too specific
Cats have certain characteristics that make them good family animals
Good topic sentence
Digital photos are composed of small squares, just like a tiled kitchen floor or bathroom.
a fact
It is a good idea to volunteer at an animal shelter
Too specific
Consider these four factors when buying your next phone
Good topic sentence
BRB, BTW, CU, and F2F are abbreviations
a fact
Learning the meaning of the abbreavation used in text messaging is like learning a new language.
Too specific
Digital cameras have serveral advantages over film cameras.
Good topic sentence
It is estimated that leisure travelers spend more than $500 billion in the United States
Too specific/Fact
Smart phones can perform a variety of useful functions.
Good topic sentence
Research shows that there are three main purposes for leisure travel.
Good topic sentence