Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage
The Flipped Classroom
The young today are facing a world (13) ____ which communication and information revolution has led (14) ____ changes in all subjects.
New demands are often (15) _____ on the schools in addition to the existing ones, to be equipped (16) ______ current knowledge and modem methods of acquiring new knowledge.The most modem concept that has appeared in the schools of the U.S. is flipped classrooms,(17) ______ students watch teachers’ (18) _______ at home and do what is called (19) _____ in class. Teachers record lessons (20) ______ students watch on their smart phones, home laptops or at lunch breaks in the school libraries. In class, they do projects, exercises or lab work in small while the teachers are just the (21) ______. In no time, this will be also a (22)_______ in most of the Vietnamese schools too.
(13) _________
