Answer:

1. It's twelve o'clock
2. It's twelve five / It's five past twelve
3. It's twelve ten / It's ten past twelve
4. It's twelve-fifteen / It's a quarter past twelve
5. It's twelve twenty / It's twenty past twelve
6. It's twelve twenty-five / It's twenty-five past twelve
7. It's twelve-thirty / It's half past twelve
8. It's twelve thirty-five / It's twenty-five to one
9. It's twelve forty / It's twenty to one
10. It's twelve forty-five / It's a quarter to one
11. It's twelve fifty / It's ten to one
12. It's twelve fifty-five / It's five to one

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Hope it helps~ヾ(＾∇＾)