replaces
... that, in Lesotho, English replaces Sotho as the medium of instruction after the fourth year of primary school?
... that, in <a href="./Lesotho" id="mwFJY" rel="mw:WikiLink" title="Lesotho">Lesotho</a>, <a href="./English_language" id="mwFJc" rel="mw:WikiLink" title="English language">English</a> <b id="mwFJg"><a href="./Languages_of_Lesotho" id="mwFJk" rel="mw:WikiLink" title="Languages of Lesotho">replaces</a></b> <a href="./Sotho_language" id="mwFJo" rel="mw:WikiLink" title="Sotho language">Sotho</a> as the <a href="./Medium_of_instruction" id="mwFJs" rel="mw:WikiLink" title="Medium of instruction">medium of instruction</a> after the fourth year of <a href="./Primary_school" id="mwFJw" rel="mw:WikiLink" title="Primary school">primary school</a>?