sentences:  This trend was reversed after independence, when French became the sole language of education at all levels.Since 1975, the four national languages have been reintroduced in the first two years of primary education, with French becoming the sole language of education from the third year onward, but in practice many primary schools in urban areas solely use French from the first year of school onward.The culture of the Democratic Republic of the Congo reflects the diversity of its hundreds of ethnic groups and their differing ways of life throughout the country  — from the mouth of the River Congo on the coast, upriver through the rainforest and savanna in its centre, to the more densely populated mountains in the far east.