Answer:
Same meaning of any word is called its synonym.
1)Fate's decree means
Ans=》2) Unfortunately [✔✔✔]
An adverb is a word which modify action, state,place of event, time of event taken with Noun,Pronoun and how action done in verb etc.
2)They were roaming aimlessly
Aimlessly is :
Ans=》4)Adverb [✔✔✔]
Objective phrase is a phrase which describe what we saying about subject.
3)You should abide by the rules.
Abide is :
Ans=》3)Objective phrase