Write the correct preposition, in, on or at.

1. on Monday, on Sunday, on Friday 2. in September, 2023 3. at 10 a.m., at 2 p.m., at midnight 4. in the morning, in the afternoon, in the evening 5. at lunchtime, at the weekend, at night 6. on 29th August, on 31st December, on 2nd May