should schools teach the students by giving them activities only besides making them learn i think teachers and the school administration should take...

As others
have said, your definition of "activities" greatly impacts this question. Also
important are factors like the subject being considered, the age and ability level of the
students involved, the preferred learning styles of the students and the preferred teaching
style of the instructor, the availability of time and space and materials, etc...

All activities need to be developed based on how they will help to further the learning
process for the students. This opens a wide variety of possibilities from which teachers may
draw, depending on their needs and goals for a particular class at a particular point in the
learning process and the particular needs of the students.