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 box of sweets will be sent by them to us
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i will be introduced by him to his friends
a lot of money was stolen by him from the shop
his patient got some good advice from him
coffee is made by mother in the morning
we were joined by a group of people on the way to the station
you are wanted by someone on the phone
the ship was driven against the rock by the storm