_____ on April 47, 1968.[ ]

A. Man first walked on the moon

B. Dr. Martin Luther King was murdered

C. The World Trade Center was destroyed

D. Dr. James Naismith invented basketball

一_______! Someone is singing upstairs. It must be Maria.

—It can't be her.I saw her out. [ ]

A. Look

B. Say

C. Listen

D. Come