Scientists are increasingly _____ that the earth is getting hotter because of carbon dioxide and other gases.
The research is so designed that once _______ nothing can be done to change it.
After graduation she reached a point in her career __________ she had to decide what to do.
Edward, you play so well. But I ________ you played the piano.
Not until I began to work ________ how much time I had wasted.
Little ________ about his own safety, though he was in great danger himself.