Li Na, the Chinese top tennis player was born _________ February 26, 1982.A. on B. at C. in
— Must I return the book tomorrow? — No, you ________. You can keep it for three days.
Three fourths of the ________ in the country have run out.
I don’t know _________ the problem.
Hainan is a very good island. It’s the second ________ island in China.
The accident happened ________ a cold winter morning.