请同学们将正确选项的字母序号以大写的方式填入空格。比如ABC... Dear Sirs, We are （1) to buy large quantity of corn and should be （2) if you would give us a （3) per metric ton FOB Los Angels, USA and （4) the earliest date you can ship. We used to （5) corn from other sources, but we now （6) to buy from your corporation because we are given o the understanding that you are able to supply larger （7) with a special （8). Besides, we are （9) that your corn is of better quality. We