Nobody knows how he was murdered, but _______ people behind the scenes can guess why.
—No wonder you caught a cold. You _______out last night without a coat. —I know how silly I was.
Smallpox, a kind of disease, has now died ________.
The discovery of new evidence led to ________.
—How much farther shall we have to go? —Another five miles until we reach the mountain _______.
On yesterday interview, he didn’t make a(n)_________ at all; what’s the matter with him?