What are the four properties that will never change

All substances have distinct properties that are constant, or never change. The properties of density, specific heat, boiling point, and melting point are constant for substances. These properties can be used to identify unknown substances in a mixture.

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Here is my best translation:   text analysis.1. read the text.2. determine the main idea of the text.3. determine the type and style of speech.4. write out 5 words and choose synonyms for them.5. find in the text all possible language tools (trails).blessed is he who was young in his youth,blessed is the one who has matured in time,who gradually lives coldwith years i could do it; who did not indulge in strange dreams,who did not shun secular black people,who at twenty was a dandy or a grip,and at thirty is profitable married; who was freed in fifty? from private and other debts,who fame, money and rankscalmly in turn achieved,about whom they have insisted for a whole century: n. n. is a wonderful person.(as pushkin).

The answer is:  

true.