This kind of cancer can be cured, provided it is ______ early.
Only when class began _______that he had left his book at home.
The students in this college are all taking courses _______a degree.
----You can’t finish the book in less than an hour, I suppose? -----________.
They said good-bye, little knowing that they_______ again.
That’s the best way we should think of _______the dying soldier.