我必须注意体重，因为我不怎么锻炼。

I have to ___watch my weight since I'm not exercising much.

过马路时要小心，以免发生意外。

___Watch how you cross the street to avoid accidents!

喝一杯酒没问题，但要注意饮食以保持健康。

A glass of wine is fine, but ___watch what you eat to stay healthy.