The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.
| A．/ | B．this | C．that | D．it |
The headmaster hurried to the concert hall only _________ the speaker
| A．to find； left | B．to find； gone |
| C．finding； left | D．finding； gone |
The engineer ______my father works is about 50 years old.
| A．to whom | B．on whom | C．with which | D．with whom |
They arrived at a farmhouse, in front of ______sat a small boy.
| A．whom | B．who | C．which | D．that |
The pen ______he is writing is mine.
| A．with which | B．in which | C．on which | D．by which |
Can you lend me the book ______the other day?
| A．about which you talked | B．which you talked |
| C．about that you talked | D．that you talked |