Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
Unless ______, the boy wouldn’t have admitted that it was he who broke the video.
After the meeting was over, the secretary ________ the new worker to the manager’s office.
The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.
_____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.
— What do you think of the novel written by the well-known writer? — Sorry, no _________!