______ most of us considered solving the problem as soon as possible, he considered it of no importance．
| A．When | B．While | C．If | D．As |
The kids were very happy as they could get tickets .
| A．on free | B．from free |
| C．for free | D．with free |
-- Do you mind my opening the window? It's a bit hot in here.
---___________, actually.
| A．Go ahead. | B． Yes, my pleasure |
| C．I would rather you didn't | D． Come on |
_______, we had to feel the way out.
| A．The light being gone out |
| B．With the light had gone out |
| C．For the light went out |
| D．The light going out |
The cancer risks _______ with smoking have been well proved.
| A．combined | B．related |
| C．associated | D．caused |
_______ with his research work, the professor cared little about any other things.
| A．Occupying | B．Occupied |
| C．Having occupied | D．Being occupied himself |