A B C D

A (make), B (as soon as possible), D (need \hope), D (on or before May 31)

A.请注意动词搭配 make an amendment。 B. as as possible这个结构只能用于有不同程度的副词，如early, soon, carefully, satisfactorily,等等。也就是说，这些副词前面可用表示程度的词进行修饰，如quite early, very carefully等。这些副词也可以有比较级和最高级，如the soonest, more satisfactorily等。但promptly的含义是 at once , at the right time,不可说 a little promptly,或 more promptly。因此，也不可说as promptly as possible。C. request后面不可接不定式作其宾语，故改为 need或hope。Require虽可接不定式，但用在此处语气较生硬。D.“最晚于5月31日”可以下列方式表达：on or before May 31,或 not later than May 31,或 on May 31 at the latest。

We agree on your A B C

D

B (as you require), C (if you agree), D (difference in premium) B, C.过去式 required表示过去有些要求，因为require的意思是“要求”，不是“提出要求”。另外 if you require and agree to pay , require的内容是什么并不清楚，难道是 to pay?因此，不宜将 require与agree to pay连在一起。当然，整句可改为We agree to insure the shipment if you require us to do so and if you agree to pay ,但这样文字太累赘不如说 We agree to insure the shipment as you require if you agree to pay 。