先到先得，英語怎麽說？

先到先得，英語怎麽說？
先到先得
first-come,first-served
或
first to come,first serived
例如:
我們教室的座位是先到先得。
翻譯成英語是：
The seats in our classroom are first-come, first-served.
或者：
Seating in our classroom is on a first-come, first-served basis.