A fantastic idea occurred to him ________ he could use a plastic bottle, ________ cut off, as a container to grow young plants in.
| A．which; whose top | B．that; the top of which |
| C．that; with its top | D．whether; whose top |
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 |
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 |