One should have a _______ of right and wrong.
—Have you checked the engine? —Yes, I did twice; there ______ be anything wrong with the car.
There came a point in his life____ he had to think about seriously about his future.
The old lady is said to have three children,two of ____studying abroad.
He had planned to make a compromise,but he changed his mind at the last minute.
Security was such a major concern at the conference that no journalists could approach the meeting zone without ________ the special pass.