根据下列各句句意和空白之后的汉语提示词，在指定区域的横线上写出对应单词的正确形式，

每空只写一词。

1. The quiet town of Centralia once had much to offer but today it lies in ______ (废墟).

2. In Europe, more than half of the 100 designers employed in the ear-making industry are art ______ (毕业生).

3. Saving the child's life from the icy lake is an ______ (令人钦佩的) thing to do.

4. Young people should develop their social skills in the real world, just as they need to eat ______ (健康的).

5. To understand the theory of rain making, you first have to know how rain ______ (形成) naturally.

6. Never ______ (犹豫) to approach your teachers whenever you need their help.

7. According to a report, the world's population is ______ (预计) to be over 9 billion in 2050.

8. Nowadays ______ (顾客) demand that their new cars look as up-to-date and fashionable as possible.

9. He benefits greatly from ______ (交流) with foreigners now and then.

10. Increasingly, art students are influencing modern ______ (建筑学), including the design of new buildings.