According to the rules of the factory, you can ask for leave ________ you have a doctor’s diagnosed(诊断) note.
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.