He _____the problem _____in his mind for a whole week before he did anything about it.
Only when the war was over ________ to his hometown.
Not until I began to work ________ how much time I had wasted.
Little ________ about his own safety, though he was in great danger himself.
Not a single song ________ at yesterday’s party.
If the new arrangement doesn’t _____, we’ll go back to the old one.