_______, Mary talks a lot about her favorite singers after class.
| A．A quiet student as she may be | B．Quiet student as she may be |
| C．Be a quiet student as she may | D．Quiet as she may be a student |
Is ________ some German friends visited last week?
| A．this school | B．this the school |
| C．this school one | D．this school where |
Is there anyone in your class ________ family is in the country?
| A．who | B．who's | C．which | D．whose |
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 |