假如你是一名导游，陪同某国际旅行社游览长城。车抵长城，下车前你准备对大家作必要的介绍和交代。请拟一份讲话稿。讲话稿必须包括以下几点：

1． 简单介绍长城（是世界上最长的城墙，有2000多年的历史，是世界奇观之一）；

2． 讲话的时间是8点半，在长城逗留两个半小时，11点钟离开：

3． 游览车（bus） 在入口处等候，记住车号，准时返回：

4． 贵重（valuable）物品随身携带，下车前关上车窗；

5． 祝大家玩得愉快。

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______ example of John shows that ______ knowledge of first aid can help a lot.

As an experienced journalist, he always has a nose ______ a good story.

Recently I realized the fact that I can now organize my own time, which ______.

Maggie is a neat and tidy student, who likes to have everything ______.

 The boss ______Mary to finish her job within a week.

We cannot figure out ______ quite a number of students were infected with the flu.

 After retirement, learning a musical instrument may be harder than ______ when you were a kid.

The opening ceremony of the 11^th National Games, ______ in Jinan, Shandong Province from Oct.15-28 was highly praised.

 — It is understandable for him to make such mistakes.

— You are right, ______ that he is only a new hand.