He paid for a seat, when he________have entered free.
| A．could |
| B．would |
| C．must |
| D．need |
---We’d like a double room with a view , please.
---I’m sorry, but all double rooms with a sea view _____________already.
| A．were reserved | B．had been reserved |
| C．have been reserved | D．have reserved |
---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 |