pick the words inside the box to complete the sentences below.

| disposed - waste - served their purpose |

| harmful - useful |

i have learned that materials have different properties. these materials are considered useful when they (1). I have also learned that some materials can be harmful when not (2)properly. It is very important to identify the (3)materials from (4)materials to stay safe. Also, everyone must be well-informed on how to properly dispose and segregate the (5)materials.