24. ---Michael is one of the top students in our class .
--- ___ , he cheated in the last exam .
| A．On the other hand | B．Generally speaking | C．To be honest | D．Above all |
Portia，for ________ physics had once been very hard，turned out to be a physicist.
| A．whom | B．whose | C．that | D．which |
Gun control is a subject ________ Americans have argued for a long time.
| A．of which | B．with which |
| C．about which | D．into which |
Wind power is an ancient source of energy ________ we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
She showed the visitors around the museum，the construction ________ had taken more than three years.(2011·江西)
| A．for which | B．with which |
| C．of which | D．to which |
Julie was good at German，French and Russian，all of ________ she spoke fluently.(2011·湖南)
| A．who | B．whom | C．which | D．that |