________ the housing price, several measures have been adopted in the last two years.
| A．Lowering | B．Having lowered | C．To lower | D．To have lowered |
_______ is well known _______ Hong Kong returned to China on July 1st, 1997.
| A．It, that | B．As, / | C．As, as | D．It, which |
—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 |