18.The insurance shall be ___________ from the time of the engineer ’ s departure from China up to the time of his arrival in China on return.  

A. effective                                                B. effecting

C. effect                                                    D. effected

19.Enclosed are sample parts ___________ some of the problem we encountered.  

A. show you                                              B. showing

C. will show                                              D. shown

20.Unless otherwise ___________, we wish to take out an All Risks insurance policy for you ___________the shipment.  

A. instructed...in                                        B. instructions...for

C. instructed...for                                       D. instruction...on

二、填空题（本大题共 25 空，每空 1 分，共 25 分）

请将答案填在答题纸相应的位置上。错填、不填均无分。

21.It is apparent that each sample has been subjected ______long periods ___________extreme sunlight.

22.However, based ___________reports from our numerous sources of credit information, we can make shipments ___________you only when cash is received.