It was________great shock to the world that two aero-planes crashed into ______World Trade Center in New York o September 11th, 2001.
The doctor ______ a cure for the disease .
You really don't know what we ______ while we were working on this project .
Father went to his doctor for ______ about his heart trouble .
I really don't know______ I had my money stolen .
35. — Could I use your computer for a few moments, please? — ______. I’m not using it myself.