Underline the correct tense. 1 The plane leaves/has left at four o'clock. We must be
at the airport by two o'clock.
2 It gets/is getting colder and colder every day.
3 Have you seen Linda? I have been looking/am looking
for her for almost an hour.
4 Sam is a very interesting person. He knows/has known
all kinds of unusual facts.
5 First, you are heating/heat the oven to a temperature
of 180°C.
6 Have you heard the news? They have just elected!
have been electing a new club chairman!
7 Martha is finding/has found a new job. She is starting
next week.
1. The person who sings is a singer. 2. The person who plays in films is an actor 3.The person who helps people when they are ill is a doctor. 4. Buckingham Palaceis the London home of the queen. 5. The capital of the United Kingdom is London 6. At science lessons pupils do experiments and learn about nature. 7. Do you speak English? 8.Let's arrange a picnic at the weekend. 9.They are a typical Russian family: a father, a mother, two children. 10.There are many endangered animals all over the word: the African elephant, the giant panda, the black rhino and others.
Объяснение:
1) The properties of building and materials are classified into four groups: physical, mechanical, chemical, technological, etc.
2) Resistance to salt aggression and other chemicals (wood)
An important advantage of natural stone is strength, durability, resistance to environmental influences, frost resistance (stone)
Strength; reliability; versatility; combination with other materials (metal)
3) All metals are divided into two groups: ferrous and non-ferrous
4) Ferrous metals and alloys contain iron, non-ferrous metals do not. Ferrous metals are mild steel, carbon steel, stainless steel, cast iron and wrought iron. ... Since they do not contain iron, non-ferrous metals have a higher resistance to corrosion and rust.
Объяснение: just decided