一、单项选择题（本大题共20小题，每小题1分，共20分）
在每小题列出的四个备选项中只有一个是符合题目要求的，请将其代码填写在题后的括号内。错选、多选或未选均无分。
1.Please do your best to expedite the covering L/C __________ we may fulfill the contract smoothly.
A. so that B. so as to
C. so as D. as
2.Packing charges __________ in the price， and we can effect shipment whenever you wish.
A. include B. are included
C. is included D. included
3.We regret to inform you that we do not have in stock the goods in the __________ quantity.
A. desire B. desires
C. desiring D. desired
4.We give you on the attached sheet full details covering packing and marking ， which must be strictly __________.
A. seen B. abide by
C. observed D. submitted
5.We are sorry for the short delivery by 20 tons. This __________ you some trouble in meeting orders of your clients.
A. must cause B. must have caused
C. has caused D. will be caused
6.Please check the enclosed letter of credit to ensure that it __________ your instructions.
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