1. 在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

1. （1） To our relief, our economy is developing (steady).
   
3. （2） For such an important problem, we shouldn't decide it (random).
5. （3） How did come about that he knew where we were?
   
7. （4） I subscribe a number of journals concerned with my subject.
   
9. （5） Keep on (go) till you come to a red brick building.
11. （6） The way he spoke to his friends resulted the failure of their friendship.
13. （7） Large quantities of energy from the sun (be) being taken with modern equipment now.
    
15. （8） We must take all possible measures (tend) to improve working conditions.
    
17. （9） Thousands and thousands of people attended the president's ceremony, with ages (rang) from 5 to 100.
    
19. （10） remains a certain doubt among the people as to the true value of the project.