他正考虑如何回报朋友们的支持。(pay back)

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根据所给的中文提示完成句子。

1．我会在两个星期后返回悉尼，因为我已经预订好了印度洋----太平洋号火车前往佩思的车票。

I’ll be back in Sydney in a ________ because I’ve made a _______ on the Indian Pacific train to Perth.

2．即使没有现代航海工具的帮助，旅行家们也不是任凭大海摆布的。

   Travelers were not       the      of the sea even though they did not have modern navigational aids.

3．这是澳大利亚14项世界遗产之一 。

   It is part of one of Australia’s 14 World               ． 

4．在晴日里，特别是在夏天，海员们能够利用正午头顶上的太阳导航。

   On a clear day       during the summer the sailors could use the sun          at midday to navigate by.

5．我最后一次看到他是周五晚上，当时他正趴在实验室的地上在找什么东西。

The last time I saw him was Friday night. He was on his _______ and _______ searching for something in his laboratory.