N=13; c13h26; напишите 3 формулы .напишите 3 формулыструктурных.​

1)If my friend comes to see me, I will very glad.
2)If my mother buys a cake, we will have a very nice teaparty.
3)If we receive a telegram from him, we will won't worry.
4)If you don't work systematically, you will fail the exams.
5)If you are busy, I will leave you alone.
6)If I live in Moscow, I will visit the Trtyakov Gallery every gay.
7)If I get a ticket, I will go to the concert.
8)If we live near a wood, We will gather a lot of mushrooms.
9)If my father returns early, we will wath TV together.
10)If she knows English, She will try to enter the uneversity.

Sharks (lat. Selachii) are a superorder of cartilaginous fish (Chondrichthyes), belonging to the subclass of elasmobranchii and having the following distinctive features: an elongated body of a more or less torpedo-shaped shape, a large heterocercal caudal fin, usually many sharp teeth on each jaw.

The Russian word "shark" comes from the Old Norse "hákall". The most ancient representatives already existed about 450-420 million years ago.

More than 526 species of sharks are known: from the deep-sea shallow Etmopterus perryi, only 17 centimeters long, to the whale shark (Rhincodon typus) - the largest fish (its length reaches 20 meters). Representatives of the superorder are widely distributed in the seas and oceans, from the surface to a depth of more than 2000 meters. They mostly live in sea water, but some species can also live in fresh water. Most sharks are so-called real predators, but 3 species - whale, giant and largemouth sharks - filter feeders, they feed on plankton, squid and small fish.