6 Complete the notice with the correct prepositions.

You can have swimming lessons **at** Lakeside Swimming Pool every day. On weekday evenings, they take place **on** the weekend. They start **on** Saturdays and at 10 am. The next course of lessons starts **on** Sundays. The next course of lessons starts **on** Monday 15th March. May we will have our annual swimming competitions **at** midday (f) and four pm (c).