Read the text and fill in the gaps with the correct forms of the given words

My favourite subject is English. [ ] lessons are very interesting. Today we've learned plural nouns. Now I know that we add the ending -s to most nouns. There [ ] also some rules which help to make plural nouns. For example, we have to add -es to the nouns which end in -s(s), -sh, -ch, -x, -o. I [ ] all the rules now. I have to learn all of them for the next lesson. But I remember plural forms of some irregular nouns, like "child" or "tooth", which have their own plural forms: [ ] and [ ].