Open the brakets and use the verbs in the correct form. Here I....(to reply) to your letter, which....(to arrive) two

Here I am replying to your letter, which arrived two days ago, before I have left for Rome. I told yesterday that the company was sending me there the following week for a business conference. If I knew about it earlier, I would have told you. Anyway, I\'ll ring you up as soon as I get there. By the way, I met John Marshall who told me that he had been working for the previous two months on the plans for the new factory you are interested in. He must have been working very hard because he looked dead tired. By the time I come to Rome he would have finished them, so I\'ll bring them with me.