HubbardsCupboard.org. has a great selection of practice sheets for beginning readers. As students learn sight words, it helps to practice them in short sentences. Below are a few passages that I often use with students:
Short Vowel Sight Words Practice
I like to read the same several passages with students repeatedly for two weeks or until they become comfortable reading them on their own. Once they are able to read the sentences fluidly and independently, they are ready for longer short stories!