A. for which B. with which C. of which D. to which
A. which; where B. at which; which C. at which; where D. which; in which
A. after that B. after which C. after it D. after this
A. where B. that C. by which D. without which
A. none of them B. both of them C. none of whom D. neither of whom
A. whose time B. that C. on which D. by which time
A. who B. which C. when D. that
A. them B. who C. whom D. these
A. their B. whose C. of them D. with whom
A. Which B. of which C. that D. whose