There will always be those that buck the system, befriend them constructively and keep your flow.

If you can keep your students engaged they will participate and learn more.

I find that if you can get on a personal basis with your students and share common interests, share happy and fun topics that this puts the student at ease. This will help build your relationship with the student and they will ask questions that otherwise would have gone unasked.

Be prepared for your course and ready to answer the relative question that come with any course material.