用所给单词的正确形式填空。

1. Carmton likes_____(music) who play different kinds of music.

2. I have never seen an_____(India) film

3. Be sure_____( close)the windows when you leave.

4. It is a_____( know) fact that he has been dead for twenty years.

5. I don't know the boy who_____(have)a big nose．

请论述生态系统中四个基本成分的作用和相互关系。