II. Fill in the blanks with appropriate prepositions. 1. We have sold a lot of shoes ________ US$5.00 per pair FOB Qingdao. 2. We do not close the transaction, because they increased their price ________ 5% and reduced the quantity ________ 25%. 3. Could you increase the quantity ________ 50 metric ton? 4. The minimum quantity ________ design is 500 yard. 5. As per the present situation, we can only supply you________ 30,000 meters. 6. As this is the first deal________ us, we agree to give you 1% discount as a special encouragement. 7. We shall appreciate it if you will make us an offer________ 100 sets. 8. The goods should be delivered________ four equal lots, that is 100,000 yards________ month.