Bacteria ali bacterias?

Vprašanje 1
Complete the sentence with the right form.
_________ usually grow in woods, but sometimes in hedges and shady places in meadows.
Fungus
Fungi
Funguses
Vprašanje 2
Complete the sentence with the right form.
Steve forgot to clean his swimming pool for two weeks and green _________ formed on the pool surfaces.
algs
alga
algae
Vprašanje 3
Complete the sentence with the right form.
She is not very good with plants, that is why she only keeps _________ in her apartment.
cacti
cactuses
cactus