句意他认为棒球是放松的.根据前一句可知这里的他指的是Bob,可定位到短文第三句:I thinnk it's relaxing to play baseball.本空正确答案为relaxing。 51.volleyball. 句意Tom喜欢排球并且玩得很好。由Tom可以定位到短文第四行最后一句:Tom likes volleyball.和第五行:He plays volleyball well...