1. (2017八下·东台月考) 根据句意和汉语提示写出单词，完成句子

1. （1） Please find out the two main (人物) in this novel after finishing reading it..

3. （2） You can take a (径直的) train to Chendu.

5. （3） Water（污染）is one of the most serious problems we are facing now.

7. （4） The aim of this course is to i your spoken English.

9. （5） How to protect the （环境）has been under discussion.