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Answer variants:
Disappearing
Signboards
Unhygienic
Livelihood
 
1.
 \(=\) A means of securing the necessities of life
 
2.
 \(=\) Be lost or go missing; become impossible to find
 
3
 \(=\) A board displaying a sign to direct traffic or travellers
 
4
 \(=\) Not clean or sanitary