1. 单词拼写

结合语境，根据汉语或首字母提示用单词的适当形式填空。

1. （1） Physics is the best example of a science which has developed strong, (抽象的) theories.
3. （2） He is (守旧的) in life when he was young.
5. （3） It's (荒谬的) that we have to wait six weeks.
7. （4） All his (尝试) to get through the driving test without being trained has failed.
   
9. （5） It's difficult to (预测) what the boy's future will be.
11. （6） Jack is late again. It is t of him to keep others waiting.
13. （7） He is not the woman's own son; she a him twenty years ago.
    
15. （8） Who p the house? In another word, who is the owner of the house?
    
17. （9） Luckily enough, I met my old classmate in the street by c the other day.
    
19. （10） As the sun sets, the s of trees becomes longer.