There is a system ________the waste is disposed of using the principles of ecology.
| A．which | B．where | C．that | D．at which |
Mr. White graduated from _____ Cambridge University with a degree in ____ physics.
| A．the; a | B．a; a | C．a; the | D．/; / |
The headmaster thought _______ necessary to invite Professor Brown to give us a lecture.
| A．that | B．it | C．this | D．him |
. How pleased the emperor was ___ what the cheats had said.
| A．hearing | B．heard | C．to hear | D．hear |
---Don’t you think it necessary that he ____ to Miami but to New York?
--- I agree, but the problem is _____ he has refused to.
| A．will not be sent; that | B．not be sent; that |
| C．should not be sent; what | D．should not send; what |
When was _____the government decided to move the citizen out of the downtown area?
| A．that what | B．that which | C．it that | D．it which |