In the hot sun the surface of the road seems wet, but that is only a(n) _______.
A. illusion
B. allusion
C. delusion
D. collusion
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The document had been typed on a small ___________.
A. transportable
B. potable
C. portable
D. portal
There is an urgent need to _________ the resources of the Irish Sea.
A. explode
B. exploit
C. explore
D. expose