Where is Mr. Lee? I have something important to tell him. —You ______ find him. He ______ Japan.

The number of the red-crowned cranes will become ____ if we don’t take any action.

_________ is known to us all is that the 20

Helen has two sisters and a brother. Her brother is working, but _________her sisters are still at school.

Scientists are working hard to make _______ possible for people to live on Mars in the future.