My new neighbor is a _____ person; he never speaks to anyone and nobody knows where he is from and what he is doing.
---Fish need water to survive; _____ , we human beings rely on air to live.
____time goes by, Mother’s hair is turning gray and the wrinkles on her face deeper.
Nowadays, there is a ____ that receiving education is a waste of time.
______ he had worked hard all the time, he failed the exam again.
Every time they met, they ____ talk about former classmates they remembered.