_________ explanation is useful.
---- What happened to you? ---- I ________ in the street when someone patted me on the shoulder, which frightened me.
--- How is the man injured in the accident? ---- The doctor said if ________ in a proper way, he was likely to be saved.
It is the only time in history that two Nobel Prizes ________ to the same person.
People laugh at jokes, but seldom ________ about how they work.
---Why does Jane always ask you for help? ---- There is no one else ________, is there?