Economical. This has the most positive connotation out of all of the options listed here.
"Inferior" implies that the quality is lesser than other potential materials that could have been used.
"Second-rate" and "Sub-standard" also imply the same message.
"Economical" has the most positive connotation, because it implies that the materials are monetarily cheap but does not really imply anything about the QUALITY of the cheap material.
Everyone behaves as a distributive pronoun
The term self-concept is a general term used to refer to how someone thinks about, evaluates or perceives themselves. To be aware of oneself is to have a concept of oneself.
THE ANSWERS ARE:
-The master stopped at the rusty iron door and pulled it open on rasping hinges.-We saw him disappear down the steps into the dark,<span>-Then we heard the awful, terrifying sound that haunted our sleep</span>
