1. The English play _______ my students acted at the New Year’s party was a great success. (NMET2004)

A. for which        B. at which        C. in which        D. on which

2. There are altogether eleven books on the shelf, ______ five are mine. (NMET2004)
       A. on which       B. in which        C. of which        D. from which
3. American women usually identify their best friend as someone ______ they can talk frequently. (SH2004)
      A. who        B. as        C. about which        D. with whom
4. George Orwell, _______ was Eric Arthur, wrote many political novels and essays. (BJ2004)