"be fully aware of" is a correct and usable phrase in written English. You can use it when you want to emphasize the need for understanding or knowledge about a certain situation. For example, "Be fully aware of the risks associated with this investment before making your decision.".
That way, he could be fully aware of his surroundings.
We must be fully aware of this dangerous possibility.
All the players will be fully aware of what they are capable of".
Spieth will be fully aware of every possible hurdle; they may even excite him.
We know the threat and we'll be fully aware of it come the weekend.
She said officers will be fully aware of what is expected.
We must be fully aware of the implications of anything that happens.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.