Although the teacher didn’t mention any names,everybody knew who he was ________.
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?
It’s reported that many a house ________ by the heavy snow so far in New York.
No one really knows for sure ________ makes a person become right-handed rather than left-handed.