The boy______ between my sister and my brother is my cousin, Jack.
| A．sitting | B．sat | C．sits | D．to sit |
---Fish need water to survive; _____ , we human beings rely on air to live.
| A．particularly | B．obviously | C．actually | D．similarly |
____time goes by, Mother’s hair is turning gray and the wrinkles on her face deeper.
| A．with | B．as | C．while | D．when |
Nowadays, there is a ____ that receiving education is a waste of time.
| A．mind | B．concept | C．custom | D．belief |
______ he had worked hard all the time, he failed the exam again.
| A．If | B．As | C．While | D．Because |
Every time they met, they ____ talk about former classmates they remembered.
| A．could | B．would | C．should | D．will |