What is the thing on the floor and what do you think it is made of?
a rug - maybe cotton, wool, polyester etc.
15
What's this and who wears it?
Usually called a hard hat. Worn by builders, miners, engineers, etc.
20
There is no real lead in pencils. Rather, the grey 'lead' part made up of a non-dangerous mineral called graphite. The common name “pencil lead” is due to historical reasons.