He did not bother answering me, his eyes were almost closed, but the impression he gave was that he was concentrating intensely and quite _______ to what was happening around us. A. wary B.
He did not bother answering me, his eyes were almost closed, but the impression he gave was that he was concentrating intensely and quite _______ to what was happening around us.
A. wary
B. alert
C. observant
D. cautious