----______was it ______ they discovered the entrance to the underground palace?
----Totally by chance.
| A．How, that | B．What, that | C．When, when | D．Where, that |
—Would you like to come to dinner tonight?
—I’d like to, ___ I’m too busy.
| A．and | B．so | C．as | D．but |
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 |