This sentence indicates a lack of interactive whiteboards. The blank should be filled with a word that emphasizes this scarcity, like 'many' (in a negative statement) or 'any' (which is commonly used in negative sentences and questions to indicate quantity). Given the structure 'There aren't...', 'any' is the most natural fit.
В отрицательных предложениях (There aren't...) для указания на отсутствие чего-либо (в данном случае интерактивных досок) используется слово 'any'.
4 There aren't any interactive whiteboards in our school.
4 В нашей школе нет интерактивных досок.