Hide-and-seek is _______ interesting game for children.
A. a
B. an
C. the
D. /
_______ Great Wall is one of the seven wonders around the world.
A. The
B. A
C. An
D. /
—Mum, I'm going on a picnic with my friends today.—Have _______ good day.
A. a
B. A
C. an
D. /