Dẫn chứng: There are some explanations for the failure of television to get the interest of the teachers. Firstly, the schools that purchased television sets have not set aside money for equipment repairs and maintenance so these television sets are sooner and later out of work. Secondly, these schools have not found an effective way to train teachers to integrate television into their ongoing instructional programs. Lastly, most teachers do not regard the quality of television and its usefulness in the classroom.

Đáp án đúng: There are three explanations for the failure of television to get the interest of the teachers.

(Firstly, Secondly, Lastly)