Пожалуйста, помогите! Нужно вставить правильно глаголы

1.He was talking so fast that it was impossible to follow what he was saying
2.What have you told us is a little different from what pr.Nikitin usually said
3.Mr Browm said
4.Lets sit down and talk about 
5.It was rather dificult for Robert to speak before a large audience,but everybody liked what he said