Premier Wen Jiabao encouraged citizens to read more on World Reading Day, which_____________ on April 23.
As _____rule, apples are sold by_______weight and eggs by _______dozen.
—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 _______.