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1. 
They allow electric current to pass through them
A.
conductors
B.
insulators
C.
semiconductors
2. 
They don’t allow electric current to pass through them
A.
conductors
B.
insulators
C.
semiconductors
3. 
Wood, Plastics, Ceramics, Glass and Air
A.
conductors
B.
insulators
C.
semiconductors
4. 
They sometimes conduct or don’t the electric current
A.
conductors
B.
insulators
C.
semiconductors
5. 
The most important materials of this type are silicon and germanium
A.
conductors
B.
insulators
C.
semiconductors