Many decades ago, Missionaries of Christian denominations, such as the Roman Catholic religious orders - particularly the Lasallian Brothers and the Sisters of the Holy Infant Jesus - Seventh-day Adventists, Anglicans, and Methodists established a series of "private missionary schools" which provided primary and secondary education in the English language. Almost all of these were single-sex schools. These schools were fee-paying and some had boarding schools attached to them. They were seen as "providing the best education" owing to the fact that they used "English as their medium of instruction". Although nowadays these missionary schools have fully assimilated into the Malay-medium national school system and most admit students regardless of gender and background, many of the schools remain single-sex and still bear their original names, such as the ones with the names of saints or words such as "Catholic", "Convent", "Advent" and "Methodist". By the 1960s, the government no longer charged fees at primary schools with a Malay-language medium; fees for Malay-medium primary schools were abolished by the Education Act of 1961 and "abolished with affect" by 1966. The missionary schools providing a curriculum in the English-language medium continued to charge fees which were "regulated by the government". By the 1980s, missionary schools were offering a curriculum - primary and secondary - in the Malay-language medium and thus no longer required to charge fees. However, donations from these school's alumni and their families are still paid today.