Knowledge of antonyms can be as helpful as knowledge of synonyms

Knowledge of antonyms can be as helpful as knowledge of synonyms or even more so. Antonyms help to avoid repetition in an essay or sound polite in a conversation. For each word choose the most suitable antonym.
1.Vague A) indefinite B) distinct C) uncertain D) obscure
2.Miserable A) gloomy B) competitive C) sorrowful D) joyful
3.Ally A) adversary B) partner C) friend D) associate
4.Stingy A) rude B) generous C) gaunt D) ignorant
5.Adjacent A) apart B) void C) bleak D) blank