Answer! i need this for a quiz! i saw two birds land on the roof of our porch. one bird had a twig in its beak. the other bird had a piece of string. which sentence could be added to the passage to best vary the sentence pattern and affect the fluency? a. i think they were a male and female robin. b. then they flew to the corner of the porch. c. i sat quietly and watched as they began to build a nest. d. without a care, the little carpenters got to work on a nest.