医生警告我要小心这种药的副作用。

The doctor ___cautioned me about the side effects of this medicine.

医生告诫病人不要吃太多甜食。

The doctor ___cautioned the patient against eating too much sugar.

医生告诫我要避免剧烈运动直到伤口完全愈合。

The doctor ___cautioned me to avoid strenuous exercise until the wound fully heals.