Mr. White, with his family, _______Taiwan by plane which_______ at 8:30 next morning according to the timetable.
| A．is leaving for; leaves | B．is leaving for; will leave |
| C．are leaving for; leaves | D．will leave for; will leave |
_________ 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 |