As you can see, we need the equipments, ___________ are necessary to make the project move on.
| A．all of which | B．all of them | C．all that | D．all what |
________ is known to everybody, the moon travels round the earth once every month．
| A．It | B．As | C．That | D．What |
This is Mr．Smith, ________ I think has something interesting to tell you．
| A．who | B．whom | C．that | D．/ |
The school _____ my father teaches is a world-famous one, _____ was set up 100 years ago．
| A．where; which | B．which; which | C．/; where | D．where; that |
The most important thing _____ we should pay attention to is the first thing ____ I have said．
| A．which; that | B．that; which | C．which; which | D．that; that |
The factory ____ the students visited last week is the one ____ I have worked for thee years．
| A．that; which | B．when; in which |
| C．/; where | D．which; that |