5. Delivery service is available for a slight extra charge.
多付一点费用就有送货到家的服务。
还能这样说：
We can provide delivery service if you pay a little extra money.
Pay more money and you can get delivery service.
应用解析：
passenger extra 临时旅客列车（临客）；
postage extra 邮费另算；
extra-heavy 特重的，超重的，超功率的；
charge extra 额外附加费用
6. We will provide a door-step delivery service.
我们会推出送货上门的服务。
还能这样说：
We will offer home delivery service.
We will service you with door-step delivery service.
应用解析：
from door to door 从一家门口到另一家门口；
the door to sth. 获得或达到某事物的门路或途径；
lay sth. at sb.'s door 归咎于某人；
next door to 几乎，差不多
7. The store is more than happy to deliver the goods to your home.
本商店很乐意为您送货上门。
还能这样说：
The store is very glad to deliver the goods to your place.
It's our pleasure to send the goods to your front door.
应用解析：
more than happy to do sth. 非常乐意做某事；
strike the happy mean 采取中庸之道；
be happy together （夫妇）和睦相处；
be happy in （幸好）有……
8. May I have your name, address, and telephone number on this slip?
请您将您的姓名、住址和电话留在这张纸上。
还能这样说：
Could you please give me your name, address and telephone number on the paper?
Can you write down your name, address and telephone number on the paper?
应用解析：
slip还可以作动词，意为：滑动；遗忘；摆脱，挣脱。