Table: t_1975_race
Columns: race_name
circuit
date
winning_driver
constructor
report

Question: Name the winner for 29 march
SQL: SELECT "winning_driver" FROM t_1975_race WHERE "date" = '29 march'

Question: Name the report for circuit of kyalami for south african republic trophy
SQL: SELECT "report" FROM t_1975_race WHERE "circuit" = 'kyalami' AND "race_name" = 'south african republic trophy'