--- Hi, Tom. Any idea where Jane is? --- She ______ be in the classroom. I saw her there just now and she said she wouldn’t go anywhere.
The lake is calm and clear, and one of the things that _____in the water is the famous tower.
The roommates have lived for three years and not once _____with each other.
My hometown, _____I spent my happy childhood, has changed a lot.
_____that the girl with an incurable disease would die soon, the boy decided to help her make her last days beautiful and meaningful.
Exploring _____space is exciting, yet dangerous. There is _____need for both robots and humans for space exploration.