If you keep on your research, you will succeed _____.
It’s quite different from _____ I read last month.
Three-fourths of the homework _____ today.
When you want to write a person’s biography(传记),you must find out _____ about his or her life.
Can you imagine _____ the work in twelve hours?
Thirty years later, the old hero returned to the small town_____ he grew up as a boy.