邻居家的狗是整条街上最友好的。

The neighbor's dog is the ___friendliest one in the whole street.

这家酒店的员工以最友好的态度帮助客人解决问题。

The staff at this hotel offer the ___friendliest assistance to guests with any issues.

这款手机应用的界面是最友好的，连小孩子都能轻松操作。

This mobile app has the ___friendliest interface, even kids can use it easily.