Кажись вот так.В первом ,собственно ,за теоремой Пифагора .Втором свойства этих углов.
<span>My name is Alex. Im 14 years old. I live in one of the most beautiful cities of Russia, in Sochi. My family is quite small. I have got a mother, a father, a younger brother and a cat. My mum is usually responsible for cooking and for buying necessary food. She prepares breakfast, lunch and dinner for all of us. Sometimes my father also cooks. It usually happens at weekends. Both of my parents are good cooks, which is why we prefer eating home-made food. However, sometimes we can also eat out. My father reserves a table in some restaurant or cafe and we spend a great evening together. It usually happens on special occasions. My favourite food is pizza. I like all kinds of pizza and other Italian dishes. For my birthday, my parents always try to arrange a pizza party. There are times when we simply order pizza for lunch or dinner, just because there is no time for cooking. Out of my mum’s home cooking I prefer Ukrainian borscht. It’s a special red cabbage soup, which is tastier to eat with sour cream. Borscht is a traditional Russian and Ukrainian dish and many foreigners want to try it when visiting these countries. In general, I can say that I am a good eater. I like many types of food, among them fruit, vegetables, sweets and cakes, etc. However, there are some products which I don’t like eating. They are mushrooms and fish. My mother knows about it and she tries not to use these products in dishes.</span>
One of the largest groups of animals is the insect group. These animals have six legs and three parts to their bodies. <em> I want to tell you about ladybugs. They are the most popular bugs in many countries.
Ladybugs are little bright and very beautiful beetles. They can fly. They are red, yellow and orange. They are able to give some orange liquid - milk. That's why they are called Ladybugs. They live from one month to one year. Their milk has got a pungent and disgusting smell, so nobody eats ladybugs. They are very useful to humans. They eat aphid and save the whole farmer's fields.</em>
Юрист -lawyer
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1) can't
2) mustn't
3) Can
4) Must
5) mustn't
6) Can't
7) have to
8) needn't
Сама делала, надеюсь чем-то помогу.