Why is it important to know your purpose and audience before you choose a topic? why is it important to know what main ideas you want to cover in your writing before you begin? how does knowing how to select good secondary sources you plan your writing?

Read the sentence. marissa heard the class bell ringing loudly walking down the hall. what is the best way to revise this sentence? `marissa heard the hall ringing loudly walking down by the class bell. `marissa heard the class bell walking down the hall ringing loudly. `walking down the hall, marissa heard the class bell ringing loudly. `walking down the hall, the class bell ringing loudly marissa heard.