Listen! Is Kate playing the piano in the room? —No. It _________ be her. She has gone to London with her parents.

Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives.

_________ my two sisters. And __________ my brother.

Is your iPad black, Mary?–No, it isn’t. ______________ is white.

We have _________ some organizations to help the poor students in the western areas of China.