Rewrite the sentences using the passive voice

Question

Rewrite the sentences using the passive voice

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Answer 1

21-Computers are used by students at their lessons.
22-The rules of the game were explained to the students.
23-The office will be cleaned tommorow.
24-The costumes for Cats were designed by John Napier.
25-Dinner is served from 7:00 pm onwards.

Answer 2

21. Computers are used by students at their lessons.
22. The rules of the game were explained to the students by the teacher.
23. The office will be cleaned tomorrow.
24. The costumes for Cats were designed by John Napier.
25. Dinner is served from 7:00 pm onwards.