Flashcard 10 - Reading and Writing Flashcard Set for the SAT Exam

The last clause does not follow the sentence pattern already established. It should instead say: “and prepare an introductory lesson”.

The sentence is giving a list of three tasks, so each task should follow the same pattern (parallelism). The first two sentences begin with a present-simple verb (shop, buy), so the last sentence should as well (prepare instead of preparing).