It was not until all the fish in the pond died that________ the situation was serious.
| A．did he realize | B．he realized |
| C．he had realized | D．had he realized |
We were just about ready to leave _____ it started to snow.
| A．when | B．before |
| C．after | D．since |
_____ the government agrees to give extra money , the theatre will have to close.
| A．Until | B．Unless |
| C．Since | D．While |
It shocked me to see ______ my neighbors treated their children.
| A．why | B．whether |
| C．how | D．since |
Will you deliver, _____ do I have to come to the shop to collect the goods？
| A．and | B．or |
| C．so | D．then |
I firmly believe _____ he said at the meeting was right.
| A．that | B．which |
| C．that what | D．what that |