Even if the cake looked delicious, John did not _____ temptation and ordered something else.

succumb to 意為「屈服於、抵擋不住」，後接誘惑、壓力、疾病等。did not succumb to temptation = 沒有屈服於誘惑，與後文 ordered something else（點別的）語意完全吻合。