我买车时，额外付钱买了一个附加项目——延保。

When I bought the car, I paid for an ___extra - the extended warranty.

这本书的精装版附带一些赠品，比如地图和海报。

The deluxe edition of the book comes with several ___extras, like maps and a poster.

GPS系统是我决定加到订单里的一个价格不菲的额外配置。

The GPS system was a costly ___extra that I decided to add to my order.