Trắc nghiệm: Peter heard a strange sound on the roof. He became very frightened,Peter heard a strange sound on the roof. He became very frightened..,Peter heard a strange sound on the roof. He became very frightened.

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Peter heard a strange sound on the roof. He became very frightened, Peter heard a strange sound on the roof. He became very frightened.., Peter heard a strange sound on the roof. He became very frightened.

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