Ответ:

Complete the rules. Use in, on and at.

  1. We use in with months (e.g. May).
  2. We use at with times (e.g. one o'clock).
  3. We use in with parts of the day (e.g. the afternoon).
  4. We use on with days (e.g. Monday).
  5. We use in with years (e.g. 2015).
  6. We use at with celebrations (e.g. New Year).
  7. We use on with festival days (e.g. Children's Day).
  8. We use on with dates (e.g. 20 March).
  9. We use in with seasons (e.g. autumn).
  10. We use at with night and the weekend.