This material is _________________ (TRANSPARENT or OPAQUE)
Opaque
Sunglasses are ___________________ (TRANSPARENT or TRANSLUCENT)
Translucent
Wood is __________________ (RIGID or FLEXIBLE)
Rigid
Plastic is made from ____________________ (PETROLEUM or ROCKS)
Petroleum
Can you recycle glass? (YES or NO)
Yes
Which material is natural: GLASS or WOOD?
Wood
Which material is vegetable (made from plants): PAPER or METAL?
Paper
Is this pen HARD or SOFT?
Hard
