9. It's convenient to make payment in US dollars.
用美元付款较方便。
还能这样说：
US dollar is very convenient to pay for the goods.
The best choice to pay for the goods is to use US dollar.

10. We don't think you'll refuse to pay.
我们相信你们不会拒付。
还能这样说：
We don't believe that you will reject the pay.
We little believed that you will refuse the payment.
应用解析：
pay for articles 付货款；
pay homage 向……致敬；
pay up debt 付清欠款

11. We will try our best to accomodate you on payment terms.
我们尽力在付款方式上照顾您方的要求。
还能这样说：
We will do all we can to use the payment terms which you require.
We will try our best to meet your request on payment term.
应用解析：
accommodate oneself to 使自己适应于；
accommodate sb. with 向某人提供

12. We can't accept payment on deferred terms.
我们不能接受延期付款。
还能这样说：
Deferred payment is not acceptable.
We don't allow postponement of payment.
应用解析：
deferred payment 延期付款；
deferrd income 延缓收益