（ ） is often the case with children, Amy has been better by the time the doctor arrived. （A）What （B）As （C）That （D）It
He talked about the classmates and the school （ ） he had visited. （A）who （B）that （C）which （D）about which
You have seen the girl （ ） sister is a Chinese teacher. （A）whom （B）of who （C）whose （D）of which
We came to a place （ ） they had never paid a visit before. （A）which （B）in which （C）on which （D）to which
This was the best model of a radio set （ ） the factory produced in 1997. （A）that （B）where （C）which （D）when
