Раскройте скобки, употребив нужное по смыслу время (Simple Past, Present Perfect): 1. The first lot of chemical equipment

1. Haven\'t the first lot of chemical equipment arrived yet? Yes, we have received a cable from the port that the goods arrived on the 20th of December. 2. Our engineers have considered the technical information of the order, however, they have not given their final answer yet. 3. When did the sellers ship the remaining goods? They shipped the goods last week. 4. We have just received some information that the world prices of compressors have increased. In this case we shall not be able to give a discount off the price. 5. Our office opened a letter of credit with the London Bank last week. However, we have just received a cable from the sellers. They write they have not got any information that we have opened a letter of credit. 6. We have settled a few points as regards the delivery of the goods since the representative of the firm has come to Moscow.