1. (2019九上·房县期中) 选择单词或词组，用其适当形式填空，使句子意思完整、通顺。（每词限用一次，其中两词多余）

take place    happen    complete    by accident    by mistake    die    leaf

1. （1） In autumn, you can seen fallen  everywhere. How beautiful they are!
3. （2） Some plants are, but most of them are still living.
5. （3） This projectby the workers last month.
7. （4） Great changes  in my hometown in the last ten years.
9. （5） It is believed that tea was invented .