1.
Oyster shells are mostly made of _____.
2.
a grey powder used in building which is mixed with water and sand or stones to make a hard substance
3.
used to describe someone who is slow to act because they feel uncertain
4.
to make new objects out of waste material
5.
Before the oysters can be sent to Green Island Cement, the hotel staff must _____ and store them.
6.
Green Island Cement wants to find a way to make more cement while also reducing the amount of waste that goes into _____.
