After finishing all the food in the little bowl，Goldilocks wanted to rest．She chose the small chair,but it was in pieces．Then she walked into the bedroom and very soon fell____in the small bed．The Bears returned to____house．Baby Bear pointed at Goldilocks and____，"That's the bad girl．She ate my food and broke my chair!"Hearing this．Goldilocks jumped up and hurried out of the house without____her basket．She decided not____for a walk in the forest again．

你的话语应该是一缕包含早春气息的柔,___________；你的表白应该是田野爆裂的豆荚，___________；你的辩答应该是凭借原则的盾牌，___________；你的呐喊应该是仰仗正义的力量，___________。

①迎承谈判桌上的唇枪舌剑     ②构思并阐述金色的成熟

③弥合朋友之间人为的小隙     ④澎湃青春的热忱和血液

计算：$\frac{1}{a-1}$-$\frac{1}{a+1}$=____