Choose the right word
The shopping centre is made of / on brick
of
This material comes from trees. It is stronger than paper.
RUBBER
This material is used to make bikes and cars. It is very rigid and strong.
The small black backpacks are made / make of fabric.
made
The bin in the classroom is / are made of plastic.
is
These are precious metals and can cost a lot of money
Gold or silver
Cakes (is / are / could / may / be) made of white chocolate
are