If anyone cares to leave( he or she, they) may do so now.

They because the person speaking is referring to people not a specific gender

To make your papers high quality, you - make sure you establish a clear purpose- use a variety of sentence structures and advanced vocabulary - organize the essay effectively to provide a coherent flow of thought/argument- stay on topic! make sure each sentence supports your thesis/argument/purpose - avoid incorrect grammar and mechanics that could detract from your credibility.- use liking words and sentences so your essay flows. as for the new strategies you have learned from the lesson, i think you can draw from he bullet points listed above. hope this !