Помогите, пожалуйста, надобно очень срочно, дам 15 балловFill in the in,

Помогите, пожалуйста, надобно очень безотлагательно, дам 15 баллов
Fill in the in, at or on
This year I spent my summer holiday in Capri, Italy. I arrived there 1) on August 1st, and stayed in my friends villa for two weeks. 2) _____ the mornings we went swimming and water-skiing, 3) _____ noon we had lunch and 4) _____ the evenings we went to a disco. I left 5) _____ Monday morning but promised to go back next year.