根据所给提示，在空白处填上合适的单词，使句子完整。(每小题1分，共10分)
However serious a problem you may have, you should have courage to face the _________(挑战).
The successful launch of Tiangong-1 showed the world our determination to_____________(探索) and use space peacefully.
Art books are ________(昂贵的) to produce, especially if they have color pictures.
In order to protect animals, he raised a lot of money to p       (促进) research on them.
Many workers were on the march, _________（抗议）against the noise and dust of their workplace.
There are six people in my family and we each have our own __________（生活方式）.
Tom had a terrible accident yesterday. F           ,he was not seriously injured.
He is a true v      who has spent much of his life helping those who are homeless without pay.
In c       places like airports or railway stations, you must take care of your luggage.
He is very kind and g        to everybody with money.