I.根据本单元所学单词及所给的提示，写出所缺单词的正确形式。
1. The teacher drew a(n) ________ (示意图) showing how the blood flows through the heart.
2. All her hopes and dreams had turned to ________ (灰烬).
3. It is possible to see the path of a(n) ________ (飓风) in the satellite pictures.
4. Visitors to the country have been asked to fill in a detailed ________ (调查问卷).
5. The wind made little w________ on the pond.
