Choose the required noun form the the ones given and use it in the necessary meaning: alga, algae, vertebrae, vertebra, formula, formulae, larva, larvae.

1 . in is very interesting to study the respiratory system of the mayfly .
2. clothes moth feed on wool, hair, feathers, fur, dried hair and leather.
3. during pupation the silk moth undergoes complete metamorphosis.
4. the young scientist has been looking for almost a decade for a mathematical that will become the basis for the creation of a universally applicable model.
5. what is the of the chlorofluorocarbon acid?
6. there are many relating the sides and angles of a spherical triangle.
7. some blue - green sea can produce poison acids.
8. take 3 capsules a day of this detoxifying , it will do you good.
9. the old man broke his and hand in a car accident.
10. a is any of the bones or segments composing the spinal column.

1. They haven't done anything. Have they done anything?
2. He hasn't given them any money. Has he given them any money?
3. You haven't brought anything for us. Have you brought anything for us?
4. I haven't taken any English books from you. Have I taken any English books from you?
5. She wasn't reading anything. Was she reading anything?
6. He hasn't written a letter to anybody. Has he written a letter to anybody?
7. Nobody by the name of Petrov lives on the third floor. Does anybody by the name of Petrov live on the third floor?
8. They don't have any English books. Do they have any English books?
9. There aren't any tall trees in front of their house. Are there any tall trees in front of their house?
10. Peter doesn't have anything in his box. Does Peter have anything in his box?
11. There aren't any parks in his town. Are there any parks in his town?
12. There aren't any good bookshops in our district. Are there any good bookshops in our district?

Who is it?Who is saying "Meow"?Simon is in the livingroom. In livingroom well. There is a circle table in the middlee of room. There is a big armchair near the fireplace/ Simon likes to read an interesting books in armchair, when it is cold."Meow! Meow!" Now he is searching sound under the table, behind the armchair, between the armchair and sofa."Nothing!". Simon is in his room. He is still searching sound on the floor, under bed, above shelf, under the carpet. "Nothing!". And he is still searching sound in left angle, in right angle. Simon surprised. "meow! Meow!" is exiting the box. "Who are you?" Simon is saying. "What is it the window?"It is a secret.Then he is seeingtwo black ear,two big green eyes and small pink nose. "Oh! It is a kitten!" Simon is saying.He is happy. He get a new friend. They will play hide-and-seek together.