Bộ ôn tập Từ cùng trường nghĩa môn Tiếng anh có đáp án (Part 2)

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.

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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.

wary

alert

observant

cautious

Giải thích

Chọn B