Rather than working through the sentences in printed order, lock the clearest pair first and use it to eliminate options fast.
Sentence 8, "The above information is for the public": here "above" sits right before the noun "information" and describes it, so this is adjective use. That gives 1-8.
Test every option against 1-8: option A has 1-8, option C has 1-8 too, but option B has 1-7 and option D has 1-6. So B and D drop out right away.
Now check sentence 7, "Look above the mantel piece": here "above" attaches to the action word "look," showing where the action happens, so it works as an adverb. That gives 2-7.
Test 2-7 against A and C: option A has 2-7, option C has 2-5. Since 2-7 is the correct pair, option C is ruled out.
Only option A survives both checks. Its remaining pairs, 3-5 (rain comes from above, standing alone as a place name, a noun) and 4-6 (above suspicion, sitting before a noun, a preposition), also read correctly.
Let's summarize:
The above information = adjective (1-8)
Look above the mantel piece = adverb (2-7)
Rain comes from above = noun (3-5)
Above suspicion = preposition (4-6)
So the complete set is 1-8, 2-7, 3-5, 4-6, which is option 1.
