1. 用方框内短语的适当形式填空

take in, break down, rely on, feed on

1. （1） Caterpillars(毛虫) a wide range of trees, shrubs and plants.
3. （2） You should your methods so that each method does a particular job.
5. （3） They the weekly boat for their supplies of food in the past.
7. （4） What we collected and became the source material for the creation.