3. Read the following sentences and divide them into two groups ‘Cement’ and ‘Concrete’.

1. This material is most widely used for the purpose of binding together masonry units such as stone and brick.

2. This material is also known to be the most important component of concrete.

3. This kind of material may be considered an artificial conglomerate of crushed stone, gravel or similar inert material with a mortar.

4. The material which contains alumina has an extremely high rate of strength increase.

5. The fundamental object in proportioning this material is the production of a durable material of requisite strength, water tightness and essential properties.

6. The most accurate method of measuring proportions is to weigh the required quantities of each material.