This study investigated EFL teachers’ evaluation of the listening tasks in the Piloted Tieng Anh 10 (Grade 10) in order to gain insight into the quality of the materials currently used for English listening instructions at Vietnamese high schools. The research also aimed to explore how the teachers adapt these listening tasks. The study was a descriptive study, in which both quantitative and qualitative data were collected. A questionnaire, classroom observations, and interviews were used in this study. Fifty teachers of English teaching at high schools in Kien Giang Province, Vietnam, were invited to respond to a questionnaire, and eight participants, high school EFL teachers who had much experience in teaching English, were also invited to the interviews. The results showed both positive and negative evaluations from EFL teachers towards the aspects of the listening tasks in the piloted Tieng Anh 10. However, the topics and authenticity of the tasks were needed to be handled. The teachers adapted the listening tasks by omitting and modifying to make the tasks more interesting and relevant to real life.