Most of the kids in our school enjoy pop songs, _______ some hit songs like Gangnam Style.

—I thought you had        English.—No. it has been useful in my work. 

We needn’t hurry all the way to the airport — the flight has been 　　　　 because of the bad weather.

—Jack, will you give  ________ book to Lily?—Ok.

---         are the Winter Olympic Games held？---Every four years.