3 Complete the sentences using in, on, at where necessary. 1 She left on Tuesday morning. 2 My guitar lesson is ........... 15 minutes. 3 We play sports ........... the weekend. 4 His birthday is ........... February. 5 I start school ........... Monday. 6 I'm meeting my friends ........... 6 pm. 7 We go to the beach ........... hot days. 8 They have half an hour break .......... lunchtime.​