Ответ:

1. I am talking on the phone now. 2. We have just received your letter. 3. The clerks finish work at six in the evening. 3 (a). Have you already made an order? 4. Please fill out the order form, b. Have you ever seen this person? 6. We deliver goods on a CIF basis; 7. We sent you an order for goods a month ago and have not yet received your answer. 8. He wrote a letter when I came to him. 9. I have not seen the new catalogs of this company recently. 10. When the phone rang, he wrote a letter. 11. Have you read today's newspapers? 12. Have you ever been to London? - No, I'll go there this year. 13. Have you already answered this letter? 14. I wanted to call this company last week, but I was able to do this only yesterday. 15. Next year we are going to increase the prices of our goods. 16. What will you do tomorrow at 10 in the morning?