4. Write the correct preposition, in, on or at.

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