Part Three: Substitution Drills
1. I’m sorry I (missed it/couldn’t go/ was away for the weekend).
真遗憾（我错过了/不能去/周末不在）。

2.We (rappelled down/ climbed up/ fell off) a 300-foot cliff.
我们沿着一个300英尺高的悬崖（攀岩而下/攀爬上去/掉下来）。

3. It was very a very difficult climb because (there are not many places to put your hands and feet/ it is a very tall cliff/ the weather is very bad there this time of year).
要爬上去很难，因为（没有很多地方可以用来放手和脚/这个悬崖很高/一年的这个时候天气很差）。

4. We went (bungee jumping/ rock climbing/ hiking) when we were in Australia.
我们在澳大利亚的时候去玩了（蹦极跳/攀岩/徒步旅行）。

5. We jumped off a bridge and (fell/ dropped /plummeted) 500 feet before the bungee cord caught us.
我们从一座桥上跳下，（下降/跳下/垂直下落）500英尺， 然后蹦极绳索把我们吊住。

6. It was (scary/ frightening/ terrifying), but (exhilarating/exciting/a real rush).
很（吓人/恐怖/可怕），但是又（兴奋/刺激/是真正的俯冲）。
  
7. I am going for (a hike /a drive /a bike ride) in the southern Rocky Mountains.
我打算（徒步/开车/骑自行车）去洛矶山脉南部旅行。

8. It will be a long (hike/ trip/ journey) 30 miles in three days.
这是一次长距离的（徒步旅行/旅行/旅途），3天要走30英里。

9. I love hiking because (you can really get in touch with nature. / the air is so clean in the mountains. / of all the wildlife I see.)
我喜欢徒步旅行，因为这样(你才可以真正接触大自然/山里的空气非常清新/我可以看到各种野生植物)。
                                       
10. I saw （a bear and a mountain lion/ an amazing waterfall/ some very rare birds）on my last hike.
我上次徒步旅行看到（一只熊和一只美州狮/非常壮观的瀑布/一些很稀有的鸟类）。