I am disappointed because I ______________my favourite writer yet.

依次填入下边一段话中横线处的语句，与上下文衔接最恰当的一组是（ ）乐观的人看见问题后面的机会， 。机会从来不会主动敲响你的门，无论你等待多少年， 。朝着既定目标前进 。①悲观的人则看见机会后面的问题②悲观的人只看见机会后面的问题③它只如一阵风拂面而过，需要你有反应能力和追随速度④需要你有反应能力和追随速度，它只如一阵风拂面而过⑤你就会发现机会的存在，充分发挥你的潜能⑥尽量发挥你的潜能，你就会发现机会的存在

A father in the UK has a wonderful ideas to send his kids to school on time. He takes his sons to their school in a white tank(坦克)

It doesn’t make any difference how we get there because we’re going to be late________

Scientists ____ thousands of chemicals before they decided on the right one in the end.