他们决定升级电脑的内存以提高性能。

They decided to ___upgrade their computer's RAM for better performance.

酒店因为超额预订，免费将我们的房间升级到了套房。

The hotel ___upgraded our room to a suite for free due to overbooking.

这款软件的新版本是一次重要的升级，增加了许多实用功能。

The new version of this software is a major ___upgrade with many useful features.