Answer:
mobile phone should be banned .
Explanation:
Because most learners don't really focus , they'llbe going through social media; most learners prefer to take pictures on the board of work than writing in theirs books immediately.
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"The Judges' combined score moved the competitor to the top of the scoreboard" is the correct response because in this case "Judges" is plural so the apostrophe is outside.
I would say that the best answer would be the last one.