Склонение во времени

Поставьте глаголы, стоящие в скобках, в требуемом по смыслу времени.? I am not hearing you well enough.It's time to go home.We couldn't walk fast.He bought this dictionary in London.I was buying something at a shop when I heard that somebody was calling my name.When he lived in London, he went to the theatre once a week.It was difficult to understand him.He was speaking too fast.She stayed with her aunt in July.