“当心！”看到球飞向孩子，她大喊。

"___Watch ___out!" she yelled as the ball flew towards the child.

如果你养了小狗，就得当心你的鞋子和家具。

If you have a puppy, you need to ___watch ___out for your shoes and furniture.

在老城区散步时，要小心狭窄街道上不平的台阶。

When walking in the old town, ___watch ___out for uneven steps on the narrow streets.