4 1. Is concrete a natural or artificial stone? 2. What kind of properties it has? 3. In what way can concrete be used in moulds? 4. Does it resist fire? 5. Is concrete used in skeleton structures? 6. How many functions have aggregates? 5. 1. In other words aggregates CAN be defined as a mass of practically inert mineral materials, which ... 2. All aggregates both natural and artificial which have sufficient strength and resistance to watering and which do not contain harmful impurities MAY be used for making concrete. 3. As aggregates such materials as sand, pebbles, broken stone, broken brick, gravel,slag, sinder, pumice and others CAN be used. 4. It sets under water, CAN be poured into moulds so as to get any desirable form. 6. 1. can 2. may 3. must 4. can 5. has to help 7. sets,can be poured, has, resists.- Present Simple.
I am going to tell you about my school. My school is very beatiful. There are many good and experienced teachers in our school. They help us to become smarter and develop our mind. Many subjects in our school help us to develop imagination. These subjects are art, history, geometry and so on.
There is a library in our school. There we can have time for reading. Our school has interesting traditions. Almost all pupils enjoy school life and friendship. Some pupils say that they have boring lessons, many tests. They are tired of doing homework. They say that they don't need so much knowledge. But I don't agree with them. I like school. I like studying.
1. Is concrete a natural or artificial stone?
2. What kind of properties it has?
3. In what way can concrete be used in moulds?
4. Does it resist fire?
5. Is concrete used in skeleton structures?
6. How many functions have aggregates?
5.
1. In other words aggregates CAN be defined as a mass of practically inert mineral materials, which ...
2. All aggregates both natural and artificial which have sufficient strength and resistance to watering and which do not contain harmful impurities MAY be used for making concrete.
3. As aggregates such materials as sand, pebbles, broken stone, broken brick, gravel,slag, sinder, pumice and others CAN be used.
4. It sets under water, CAN be poured into moulds so as to get any desirable form.
6.
1. can
2. may
3. must
4. can
5. has to help
7.
sets,can be poured, has, resists.- Present Simple.
I am going to tell you about my school. My school is very beatiful. There are many good and experienced teachers in our school. They help us to become smarter and develop our mind. Many subjects in our school help us to develop imagination. These subjects are art, history, geometry and so on.
There is a library in our school. There we can have time for reading. Our school has interesting traditions. Almost all pupils enjoy school life and friendship. Some pupils say that they have boring lessons, many tests. They are tired of doing homework. They say that they don't need so much knowledge. But I don't agree with them. I like school. I like studying.