题目内容：

阅读下列材料，在空白处填入1个适当的单词或括号内单词的正确形式。

It was a hot, sunny day in a national forest. 1. (unfortunate), my best friend, Ned, and I got lost. 2. we realized that we were separated from our group, we immediately tried to find a safe place to set up our base. We found a small area next to a stream. Then we started a fire with some leaves and sticks 3. (collect) nearby.

While I was watching over the fire, Ned brought more plants, 4. were put in the water and then slowly thrown into the fire. The wet leaves created a lot of smoke. Then we started to write some short notes 5. (say), “WE ARE LOST! If you find this message, you will find us upstream. We are keeping up a smoky fire. Please find us!” They were made into paper boats and sent downstream, one every five minutes. We hoped that these boats would draw somebody’s attention.

Supposing our group was well 6. their way, we wanted to be ready for 7. (they). Ned and I started to look for two hollow logs（空心圆木）and a few strong 8. (stick). Our small fire still produced plenty of smoke. Soon we were very lucky to hear whistles（哨子声）far in the 9. (distant). I was sure it must have been the smoke that worked. Now it was time to start drumming on the hollow logs. We enjoyed this part because we got to sing and shout along with the beat（打击声）. Soon we 10. (find) by our group and we headed back to our camp with an exciting story to tell.