Chapter 1 Introduction 1. Background 2. Purpose and Research Questions Chapter 2 Literature Review 1. Teacher Support 2. Learning Engagement 3. Language Learning Attitude 4. Listening Proficiency 5. Blended Learning 6. Summary Chapter 3 Methodology 1. Overall Research Procedure 2. Participants 3. Variables of the Study 4. Operational Behaviors of Teacher Support in the Blended Course 5. Instruments 6. Data Analysis Chapter 4 Results and Discussion 1. Effects of Teacher Support on Learning Engagement in a Blen- ded Learning Environment 2. Effects of Teacher Support on EFL Students' Language Learning Attitude in a Blended Learning Environment 3. Effects of Teacher Support on EFL Students' Listening Profi- ciency in a Blended Learning Environment Chapter 5 Conclusion and Suggestion 1. Conclusion 2. Limitations and Suggestions References Appendix