5. We expect your order, which will have our immediate attention.
我们期待贵公司的订单，并会第一时间给予关注。
还能这样说：
We hope you will favor us with your order, which shall have our best attention to give you a complete satisfaction.
We hope to receive your order with our great attention.
应用解析：
be in/out of sb.'s favor 得到（失去）某人的尊重、赞同等

6. We can deliver the goods within three days after receiving your order.
我们收到您的订单后，3天内就能发货。
还能这样说：
We can deliver the goods in three days after receiving your order.
We can send the goods to you in three days as soon as we receive your order.
应用解析：
deliver over/up to 把……移交出去，把……转交给

7. I'm more interested in being able to deliver goods on time or not.
我更感兴趣的是能否按时交货。
还能这样说：
I pay more attention on whether the goods can be delivered on time or not.
I am more concerned about being able to deliver goods at the appointed time.
应用解析：
able 能干（指人具备做事情所需要的才能或卓越的才干）；
capable 胜任（指人或物具有能满足普通要求的能力）；
competent 称职（指具有做好某种工作或职务的能力）

8. I think we can strike a bargain with you if your price is competitive.
我认为如果价格有竞争力，我们就可以达成交易。
还能这样说：
We can get the transaction concluded with you in that the price is competitive.
We can transact with you if you can provide competitive price.
谚语：
A bargain is a bargain.
买卖一言为定，达成的协议不可撕毁。