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.

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.

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 　　　　　　　. 　

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.

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.