.
She offered me practical ________ with my research, for which I would appreciate for my whole life.
| A．conduct | B．certificate | C．admiration | D．assistance |
__________ 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 |
—__________you like the car so much，why not drive it back?
—Well，I can’t afford__________car.
| A．Now that; that big a |
| B．If; such big a |
| C．When; so a big |
| D．So long as; that a big |
__________there are only 20 minutes left before the train left，I felt uneasy in the taxi to the railway station.
| A．That | B．When | C．Which | D．Because |