依次填入下面一段文字横线处的语句，衔接最恰当的一组是 （ ）瓦莱里在《人与贝壳》一文中说：“无知是一种无价之宝， 。你随意翻阅一部字典或编撰一部辞书，便会发现每一个字都遮掩着一个无底洞。”①有的人则由于不知如何利用它而任意荒废，②然而绝大多数人却将它任意处置，③我们应该在那些自认为最了解的领域内探索自己的无知，④这真是天大的错误，⑤有的人通过学习破坏了它，⑥人们本应珍惜它的一点一滴，

Did you visit the famous museum? — No. We _____ it, but we spent too much time shopping. [ ]

Who is dThere are

There is no doubtone who gets to the finishing line first will win the first prize.

The expert offered us another piece of advice , ___ of great help to our program.