We came to a place （ ） they had never paid a visit before.
（A）which
（B）in which
（C）on which
（D）to which
（ ） 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
