问题补充：
In the past 10 years people have become more the safety of their privacy.
A. worrying about
B. cared about
C. concerned about
D. paid attention to
答案：
A. worrying about
B. cared about
C. concerned about
D. paid attention to
解析：固定词组。Be concerned about…担心；结合句意可知C正确。句意：在过去的里，人们对于他们的隐私安全更加担心。
