AIDS is a/an ___________ disease.

A. endanger

B. dangerous

C. endangered

D. danger

Knowledge: Kind words

endanger (n) cause danger

dangerous (adj) dangerous

endangered (adj) in danger of extinction

danger (n) danger

The position to be filled is an adjective because it modifies the noun disease => type A, D

Based on the sentence context, answer B is the most suitable

=> AIDS is a/an dangerous disease.

AIDS is a dangerous disease.

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