n. a person, team, etc. that has won a competition, especially in a sport
A. confusion
B. duration
C. conjunction
D. champion
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v.to question whether a statement or an action is right, legal, etc; to refuse to accept sth.; n. a new or difficult task that tests sb.'s ability and skill
A. challenge
B. congress
C. distress
D. disadvantage
n. two or more things joined or mixed together to form a single unit
A. charity
B. duration
C. conservation
D. combination
n. the protection of the natural environment; the official protection of buildings that have historical or artistic importance
A. duration
B. conservation
C. dimension
D. disadvantage
adj. easily damaged or broken; not strong and easily becoming ill/sick; small and having a beautiful shape or appearance
A. decent
B. delicate
C. considerate
D. definite