Read the following text and answer the question no. 3 and 4: 21 February is observed as Shaheed Dibosh every year throughout the country in remembrance of the martyrs of language movement of 1952. The commemoration begins at the early hours of the day with mourning songs that recall the supreme sacrifices of our language martyrs. People wear black badges and go to the Shaheed Minar in barefoot processions, singing mourning songs. They place wreaths at the Minar. Many of them visit the graves of the martyrs at Azimpur graveyard and pray for them. They also attend various programmes organised in remembrance of the language martyrs

The UNESCO (United Nations Educational, Scientific and Cultural Organisation) en 17 November in 1999 proclaimed February 21 as the International Mother Language Day in recognition of the sacrifices of the martyrs for the rightful place of Bangla. Two Bangladeshi expatriates living in Vancouver in Canada, Rafiqul Talam and Abdus Salam, sent a proposal to Kafi Anan, the then Secretary General of United Nations. They requested him to declare 21st February as the International Mother Language Day. They added that the decision will honour and save all extinct languages of the world. As per their logical expectations Prime Minister Sheikh Hasina then took prompt initiative by sending formal proposal to UNESCO. Finally, on 17 November 1999, UNESCO declared 21st February as the International Mother Language Day. The day is now annually observed worldwide to promote awareness of linguistic and cultural diversity and multilingualism.