Here’s the dialogue with the verbs in the correct form:
Laura: I have written (1: write) twelve e-mails so far this morning.
Fiona: I know. It's so busy. Yesterday the phone seemed (2: seem) to ring all day.
Laura: Did Mr Charles phone (3: phone) yesterday?
Fiona: No, I don't think so. I did not speak (4: not speak) to him.
Laura: Yes, I saw (5: see) him at the coffee machine a few minutes ago.
Fiona: He was (6: be) at the coffee machine a few minutes ago.