watch carefully
watch closely
watch intently

Now he stood on the far side of the street, watching carefully.

The growth and development of such a child was watched carefully by the entire community.

Your child will be watched carefully by the hospital staff.

And somebody will be watching carefully to see how it's taken out of the country.

He watched carefully to see whether anyone had paid more than the expected attention.

"I am watching carefully now to be certain that we are not being followed."

I watched carefully, trying to understand what was going on.

Still, for months to come he would have to be watched carefully.

I took my time getting to the area, watching carefully for police cars.

The key to any successful garden is to watch carefully.