At first, he didn’t accept the invitation to go hiking because he thought it wasn’t _______.

interesting

At first, he didn’t accept the invitation to go hiking because he thought it wasn’t interesting.

(Lúc đầu, anh ấy không chấp nhận lời mời đi bộ đường dài vì anh ấy nghĩ rằng nó không thú vị.)

Đáp án: interesting