1 . 用方框内短语的适当形式填空

1. We are taking steps to ______ air ______ being polluted.
2. Australia ______ kangaroos.
3. The witch ______ the frog ______ a prince.
4. I’ll call him ______, but then we have to leave.
5. They come out only at night and ______ some insects.
6. These traditions have been ______ from one generation to the next.
7. Our mission is to find ways for people to live ______ nature.
8. Floods ______ much of the topsoil ______