Exercise on That and Which  
http://grammar.ccc.commnet.edu/grammar/pronouns.htm


Gender-Free Legal Writing – Managing The Personal Pronouns by Arthur L. Close, Q.C.. British Columbia Law Institute, 1998
Having a difficult time with her/him and other awkward ways around pronouns? Check out this gender-free style of writing - one that avoids the pronouns entirely. This manual explores a number of techniques that you may use to create documents that are free of gender-specific pronouns. A terrific guide with plenty of examples of text revised to a gender free style.