People in the west ______it a rule to buyChristmas presents for their relatives and friends.

依次填入下列各句横线处的成语，最恰当的一组是①李小明在这次学校举行的＂诚信＂讲演海选比赛中，台风稳重， ，成功进入复赛。②莫言讲起他在高密东北乡的故事， ，使很多文学青年也非常向往。③实干兴邦，空谈误国。没有调查就没有发言权， ，很令人讨厌。

Life of Pi is about an Indian boy who finds himselffloating in _____ Pacific Ocean with_____ Bengal tiger after a shipwreck

________ a moment and I will go to your rescue.[ ]

He was walking along the river __________ he saw a little boy lying under a tree.[ ]