小心狗。

___Beware of the dog.

在草地地区，小心像蜱虫这样可能携带疾病的昆虫。

In grassy areas, ___beware of insects like ticks that can carry disease.

虽然冲浪很有趣，但要小心危险。

Although it's fun to surf, ___beware of the dangers.