Table: t_2002_03_china_team
Columns: season
skip
third
second
lead
alternate
events

Question: What was the lead with an alternate of li dongyan?
SQL: SELECT "lead" FROM t_2002_03_china_team WHERE "alternate" = 'li dongyan'

Question: Which lead had a season of 2007-08?
SQL: SELECT "lead" FROM t_2002_03_china_team WHERE "season" = '2007-08'

Question: Which lead had a season of 2009-10?
SQL: SELECT "lead" FROM t_2002_03_china_team WHERE "season" = '2009-10'