1.A container for any solid or liquid material can be reused after it has served its purpose. Therefore, it is _________________. *
A.Useful Materials

B.Harmful Materials
C.Waste Materials
D.Toxic Materials

2.Some materials may also bring hazards to living things. These are __________________. *

A.Useful Materials

B.Harmful Materials
C.Waste Materials
D.Toxic Materials

3.When a material already served its primary use and can be discarded, it is considered a ________. *
A.Useful Materials

B.Harmful Materials
C.Waste Materials
D.Toxic Materials

4.Waste materials that cannot be dumped straight into a landfill due to hazard it may bring to the environment are called _______________. *
A.Useful Materials

B.Harmful Materials
C.Waste Materials
D.Toxic Materials