The UN officials say it could be many weeks and even months ____ a deal is reached．
| A．before | B．after | C．when | D．as |
you have seen both fighters, will win?
| A．Since; do you think who | B．As; who you think |
| C．When; whoever | D．Since; who do you think |
–Who should be responsible for the accident?
-The boss, not the workers. They just carried out the order .
| A．as told | B．as are told | C．as telling | D．as they told |
He was busy writing a story, only once in a while to smoke a cigarette.
| A．to stop | B．stopping | C．to have stopped | D．having stopped |
Distinguished guests and friends, welcome to our school. the ceremony of the 50th Anniversary this morning are our alumni（校友） from home and abroad.
| A．Attend | B．To attend | C．Attending | D．Having attended |
I like getting up very early in summer. The morning air is so good .
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |