On April 13th, 2012_______ press conference is held by Los Angeles Police Department at___________crime scene of a shooting incident.
| A．a; the | B．a; a | C．the; a | D．the; the |
_________ I felt somewhat disappointed and was about to leave，something occurred which attracted my attention.
| A．Unless | B．Until | C．When | D．While |
There is no doubt that he is a good professor__________he is doing fine.
| A．but | B．because | C．so | D．yet |
__________ there are a large number of chemical factories，the air is likely to be polluted.
| A．That | B．Where | C．Once | D．As |
_________，this kind of disease can do great harm to people there.
| A．Occurring where |
| B．It occurs where it is |
| C．Where does it occur |
| D．Wherever it occurs |
I’m willing to lend you a hand__________busy I’m for the moment.
| A．because | B．but that | C．but | D．however |