______time went on, the people in the area came to realize how serious the environment had been polluted.
| A．As | B．With | C．When | D．While |
I agree to his suggestion __________ condition that he drops all charges.
| A．by | B．in |
| C．on | D．to |
__________ the bad weather we enjoyed our holiday very much.
| A．As a result of | B．In spite of |
| C．Because of | D．According to |
-Must I do well in all the subjects, Mum?
-Sure, baby ！ As an old saying goes, knowledge is __________.
| A．command | B．effort |
| C．power | D．energy |
-When did the Great Wall __________？
-In the Qin Dynasty.
| A．come into being | B．come into use |
| C．come into effect | D．come into power |
That was the first time Helen __________ the meaning of love.
| A．understands | B．had understood |
| C．has understood | D．understood |