The Niagara Waterfalls, _____ is shaped like a semicircle, are 670meters wide, and fall 56 meters in an awesome white sheet of water.
| A．which | B．where | C．the largest of which | D．in which |
As a lover of popular music, she enjoys listening to it _____ MP3.
| A． in | B．on | C．with | D．by |
Scientists have shown that there is a connection ____ cigarette smoking and certain diseases.
| A．with | B．between | C．to | D．for |
Though _____ my opinion, my mother didn’t say anything to show that she agreed with me.
| A．against | B．on | C．for | D．in |
The visit of the police was not connected ____ the lost child.
| A．by | B．with | C．to | D．in |
The journey around the world took the old sailor nine months, _____ the sailing time was 226 days.
| A．of which | B．during which | C．from which | D．for which |