那只猫一整天都自己待在家里。

The cat was in the house ___by ___itself all day.

那只狗自己设法把箱子拖进了房间。

The dog managed to drag the box into the room ___by ___itself.

不应把兔子单独留下太久。

A rabbit shouldn't be left ___by ___itself for too long.