1 . _____________ (concern) about the safety of my property, I rushed home in spite of the heavy rain. (所给词的适当形式填空)

2 . I think I speak for all factory managers when I say we ________(concern) about the environment. (所给词的适当形式填空)

3 . Police said they were _________ (concern) about the boy’s safety. (所给词的适当形式填空)

4 . _________(concern) about my safety,   my mother didn’t go to bed until I came back.