Hi, i was writing an essay and i'm not sure what the correct punctuation would be for this "nethergrave" uses it more effectively than "a sound of thunder"would the period be placed like this "a sound of thunder." or like this "a sound of thunder". you!

Read the paragraph. [1] cory tried out for his school play, rumors, by neil simon. [2] cory got the part of “ken.” [3] cory attended rehearsal every day after school, and he practiced his lines every night. [4] cory was fantastic on opening night. [5] cory made the audience laugh! why does this paragraph lack sentence variety?