I was too scared to tell him what I really thought. -> I lacked

Tạm dịch: Tôi đã quá sợ hãi để nói với anh ấy những gì tôi thực sự nghĩ.
Ta có cụm từ: Lack the courage to V: thiếu dũng cảm, thiếu dũng khí làm gì
→ Đáp án: I lacked the courage to tell him what I really thought.

I was too scared to tell him what I really thought. -> I lacked___________________________________________________

I was too scared to tell him what I really thought.
-> I lacked___________________________________________________