21 , a world of information is at our fingertips with a click of a button or a

Mark the letter A, B, C, or D to indicate the correct option that best fits each of the numbered blanks from 18 to 23.

Technology is developing, so it has enabled us to do some amazing things. The question is: "What will schools be like in 20 years' time?".
Schools have experienced a transformation over the last 80 years - from chalkboards to interactive smartboards and from notebooks to iPads. The concept of a teacher standing at the front facing rows of desks with students who listen and take notes (18) ______. Digital classrooms will enable students to take part in learning activities anytime and anywhere.
Some people believe that it is only a matter of time before cyborg guides begin to replace teachers in schools. However, it's more likely that robots will be used to support teachers in (19) ______. For instance, robots can be used to (20) _______. This can help to improve student's learning as it will help students learn in the best way.
Besides, virtual reality headsets will play a bigger role in the schools of the future. (21) ________, a world of information is at our fingertips with a click of a button or a simple voice command. We are moving away from the time when students' schoolbags were full of books. This is the generation of tablets and 3D Digi books, (22) ______ with 3D objects by touch. What's more, with virtual reality headsets, students may participate in historic scenes or (23) _______ without leaving the classrooms. Everything may be a feature of schools in years to come. However, only time will tell how many of those possibilities will happen in the future.
(Adapted from Bright Workbook)