What are some of the ways that teachers can help motivate all students to do their best?

Answers will vary. Teachers can help motivate all students to do their best in various ways. Here are some suggestions:
~Make the classroom and the lesson interesting and inviting.
~Ensure that students can profit from social interaction.
~Make the classroom a safe and pleasant place.
~Recognize that students' backgrounds can give rise to diverse patterns of needs.
~Help students take appropriate responsibility for their successes and failures.
~Encourage students to perceive the links between their own efforts and their achievements.
~Help students set attainable short-term goals.