Task 1
1. Both the metals and the polymers can be alloyed.
2. It is possible to develop polymeric substances with the scheduled properties.
3. The so-called "aging" of the polymers is due to chemical and physical changes caused by the effect of light, heat and humidity.
Task 2
1. Polymers are characterized by their viscosity colour and softening points.
2. The properties of the polymers depend on their super-molecular structure.
3. The main concern of researchers and engineers is to improve the quality of mass produced goods.
Task 3
1. Polymers are widely used in industry.
2. Light, heat and humidity affect the polymers.
3. The main concern of the researchers and engineers is to improve the quality of polymers.
a. complete the sentences, put the verb into the correct form, positive or negative. (simple past tense). 1. it was warm, so i took off my coat. (take). 2. the film wasn't very good. i didn't enjoy it very much. (enjoy). 3. i knew sarah was very busy, so i didn't disturb her. (disturb). 4. i was very tired, so i wentto bed early. (go). 5. the bed was very uncomfortable. i didn't sleep very well. (sleep). 6. sue wasn't hungry, so she didn't eat anything. (eat). 7. we went to kate's house but she wasn't at home. (be). 8. it was a funny situation but 12. it was hard work carrying the bags. they were very heavy. (be)
In the future we won't travel by plane. We 'll travel by spaceship.
It's raining outside so we 're going to get wet.
In 2050 every person in the world will have a mobile phone.
We 'll discover life on other planets in the future.