词汇填空（根据首字母或者汉语提示完成句子，共15题，每题1分）
The world __________（存在）, whether you like it or not .
Fans are curious who will __________（替代）late actor Paul Walker in Fast and Furious 8 .
Science magazines recognized the discovery of “ gene for mental illness ” as a great scientific __________（突破）.
Organizers say it is __________（标准的）practice to play pre-recorded music at such a large event as the Olympic opening ceremony .
Only a few of the many __________（物种）at risk of extinction actually obtain protection like pandas .
During Christmas , he , as well as his sister , always __________（志愿）to help serve meals to people who have no homes .
Over the next decade , the Internet will have a __________（深刻的）effect on the tourist industry .
Even in some smoker-friendly countries like China , smoking is f__________ in public places .
I e__________ great difficulties in learning physics , but I didn’t lose heart .
Most of the college graduates prefer to find a p__________ job rather than start their own business .
The expression on his face i__________ that he was upset about the result .
The d__________ of the rainforest will undoubtedly contribute to global warming .
He took all kinds of tests to prove he was q__________ for this important task .
Firefighters and police held moment of silence for the v__________ of Tianjin explosion .
Personally , to read the o__________ work is better than to see the film based on it .