While crossing the street, an old man was knocked down by a car and badly .
We’ll look into the case as soon as we can. Just be ________, please.
How the big forest fire has ________ remains to be a mystery.
Only ______ a human being.
---Why didn’t you tell me the truth about his illness? ---___________, I knew nothing about it at that time.
---I am afraid that I have to trouble you with this question. ---___________.