15. Not until father came in ______ to prepare my lessons.
| A．I began | B．did I begin | C．I had begun | D．had I begun |
The officer gave orders that anyone________ a gun should be reported to the police station.
| A．sees take | B．see taken | C．seeing take | D．seen taking |
Had it been possible, I would have gone to attend Monica in the hospital, but I________ fully occupied last month.
| A．had been | B．was | C．am | D．have been |
When asked what original intention led them to volunteer, about half of___ said they were willing to devote themselves.
| A．whom | B．whose | C．them | D．who |
We are using so many raw materials every day, which _______ that they _______.
| A．are running out ; will be used up |
| B．are being run out; will run out |
| C．have run out of ; will be using up |
| D．have run out; will run out of |
On average, 50 percent of those _____ said they would prefer to see Mr. Obama win the 2012 ticket, _____to just nine percent who prefer Mr. Romney.
| A．to be questioned; compared |
| B．having questioned; comparing |
| C．questioned; compared |
| D．questioning; comparing |