b Circle the correct preposition. 1 I have a shower(in)/ on / at the morning. 2 They go on holiday in / on / at August. 3 My sister studies economics at / in / to university. 4 My brother goes to bed in / on / at midnight. 5 Do you live at / in / to a house or flat? 6 We have English classes in / on / at Tuesdays and Thursdays. 7 The children have lunch at / in / to school. 8 Tina works in / on / at the weekend. 9 Jack goes at/ in / to the gym after work. 10 It's very hot in / on / at the summer.