When Chinese people talk about American cities，the first comes into their minds is San Francisco.
| A．city | B．one | C．that | D．of them |
This is the use which we made_____sea resources.
| A．it of |
| B．use of |
| C．which of |
| D．of |
I'11 never forget the days _____ I lived in the country with the farmers,_____has a great effect on my life.
| A．that; which |
| B．when; which |
| C．which; that |
| D．when; who |
Something will have to be done about the air pollution,_____?
| A．won't it |
| B．will it |
| C．has it |
| D．does it |
Is this the museum _____we visited last year?
| A．the one |
| B．that |
| C．where |
| D．in which |
Though they are not very sure of the long-term ,all the scientists agree to start_____,all the scientists agree to start the research immediately.
| A．affect |
| B．effect |
| C．result |
| D．affection |