1 . At last, they were able to feel _________________ (security) about the future. (所给词的适当形式填空)

2 . Parents should make their children feel __________, loved and wanted. (security) (所给词的适当形式填空)

3 . Social media companies must take responsibility for building a ______ (security) network environment. (所给词的适当形式填空)