Looking at the rounds so far, the opponent’s moves in even rounds are consistently rock, while in odd rounds he alternates between paper and scissors (round 1: paper, round 3: scissors, round 5: paper). This suggests that in odd rounds his most common move might be paper, with a possible alternating pattern, so round 7 is likely to be paper or possibly scissors. Choosing scissors beats paper and at worst ties with scissors, making it a favorable option compared to rock. Therefore, I choose scissors.