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.
