Fungi, like animals, use the polymer chitin, as a structural base as do many animals. In general, they are also consumers rather that producers of carbohydrates and use cellular respiration to convert carbohydrates into energy. Fungi do not engage in photosynthesis although they can form symbiotic relationships with photosynthetic bacteria or algae, and are therefore are considered phylogenetically closer to Animalia.
I do have an issue with viruses being considered alive given that they do not meet the minimum criteria of having a separate metabolism and ability to reproduce. There is a minority view among virologists that the virus is actually the infected cell and virions (the capsid that contains and delivers the viral genome) is just a spore-like distributor, but given what we know and speculate about the genesis of viruses–that they are frequently derived from the genetic material of origin species–I’d hesitate to really classify them as independently living in any sense of term, and because of how they reproduce they do not follow the normal logical of evolutionary synthesis.