21. Computer games ____ encourage players to move up levels and earn highscores may help develop mathematical skills.
A. they B. those C. which D. whose
22. All forms of discrimination against all women and girls ____ immediatelyeverywhere.
A. must be allowed B. must be followed C. must be taken away D. must be ended
23. A major issue for teachers ____ allow students to use their own devices is how to provide online access to such devices.
A. who B. those C. they D. ones
24. A common reason that someone ____ more for similar work is because of his or her experience or “length of service”.
A. can be paid B. must be paid C. may be paid D. should not be paid
25. The examination papers ____ by machine. The students ____ of theirresults next week.
A. should be scored - are told B. will score - will be said
C. can be scored - can be told D. are scored - will be informed