Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 1)

 He believed that sharks could sense fear, and that this triggers the attack response. Dr Ritter, a yoga expert, had learnt (78) to lower his heart rate

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He believed that sharks could sense fear, and that this triggers the attack response. Dr Ritter, a yoga expert, had learnt (78) ……………………. to lower his heart rate

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Giải thích

Đáp án: how