She chose the least expensive of the hotels.

她挑了一家最便宜的旅馆。

So far it is the least expensive.

到目前为止，这是能为明晚提供的最便宜的套房。

This watch is the least expensive of all.

这块表是所有表中最便宜的。

Which is the least expensive restaurant in town?

最便宜的饭店是哪个？

This is the least expensive suite we have at the moment.

到目前为止，这是最便宜的套房。