Key to Exercises of Unit 4 I. Multiple Choices： 1－5 acdba 6－10 cdadc 11-15 bcdbb II. Identify errors in the following sentences： 1－5 bbabc 6－10 acadd III. Fill in the blanks with proper words： 1. for 2. of 3.for 4. of 5. to 6. by 7. at 8. of 9. for 10. within 11.for 12. of 13. at 14. on 15. for 16. of 17. for 18. by 19.of 20. to IV. Put the following English into Chinese： 1. regular supply定期供应 2. trade regulation贸易条例 3. state-operated国营 4. special discount 特别折扣 5. on the high side （价格）偏高 6. keen competition激烈的竞争 7. under separate cover 另外邮寄 8. packing list 装箱单 9. by request 依照请求 10. fair average quality大路货 V. Put the following sentences into Chinese： 1、我们有意购买你们的“海尔”牌空调器，请寄你们产品目录。 2、如蒙告知你们在上海电视台做广告的“斯特劳斯”牌钢琴的详情，我们将非常感谢。 3、只要你们维持适中价格，你们产品会在此地易于推销。 4、如能保证长期供应，我们可以向你们多次定购。 5、如果你们产品质量良好，价格合理，我们将向你们大量定购。 6、如果你们的价格有竞争力，我们将向你们大量定购。 7、如果你们能按照我们要求的型号和质量供货，我们将向你们大量定购。 8、我们附上最新插图目录供参考，以回复你们来信。 VI. Put the following sentences into English： 1.We areinterested in your Model 486 computers and should be glad if you would send us by return prices of computers available stock. 2.If your first order turns out to our satisfaction large repeat orders will follow. 3.As soon as we receive your specific enquiries we will make you best offer on CIF Lagos basis. 4.As for terms of payment, we need irrevocable L/C payable by draft at sight. 5.The articles we require should be durable in quality, bright and attractive in color. 6.As the flour mill is a regular buyer of wheat, we can assure you of their repeat orders in future if your price and quality are acceptable. 7.We enclose quotation sheet against your Enquiry No. 15 and look forward to your confirmation. 8.We used to import bicycles from USA but now we divert our buying to other countries.