perpetual (Adjective) : continuous; continuing for a long period of time with interruption
eternal (Adjective) : without an end; continuing forever; constant
innumerable (Adjective) : countless; too many to be counted
unmeasurable (Adjective) : that cannot be measured
prolonged (Adjective) : extend; to make something last longer

Correct Option: D

perpetual (Adjective) : continuous; continuing for a long period of time with interruption
eternal (Adjective) : without an end; continuing forever; constant
innumerable (Adjective) : countless; too many to be counted
unmeasurable (Adjective) : that cannot be measured
prolonged (Adjective) : extend; to make something last longer

dumbfounded (Adjective) : unable to speak because of surprise
flabbergasted (Adjective) : extremely surprised; astonished
scared (Adjective) : afraid of something
embarrassed (Adjective) : feeling shy or ashamed or awkward
humiliated (Verb) : to make somebody feel ashamed and stupid

Correct Option: C

dumbfounded (Adjective) : unable to speak because of surprise
flabbergasted (Adjective) : extremely surprised; astonished
scared (Adjective) : afraid of something
embarrassed (Adjective) : feeling shy or ashamed or awkward
humiliated (Verb) : to make somebody feel ashamed and stupid

doubtful (Adjective) : not sure; doubtful
dubious (Adjective) : not certain; doubtful
disputable (Adjective) : that can or should be questioned or argued about
duplicate (Adjective) : being too identical; identically copied from an original source
dangerous (Adjective) : likely to harm or injure somebody

Correct Option: A

doubtful (Adjective) : not sure; doubtful
dubious (Adjective) : not certain; doubtful
disputable (Adjective) : that can or should be questioned or argued about
duplicate (Adjective) : being too identical; identically copied from an original source
dangerous (Adjective) : likely to harm or injure somebody

sweet (Adjective) : having a taste like sugar or a pleasant smell.
dulcet (Adjective) : sounding sweet and pleasant
dull (Adjective) : not interesting or exciting
hard (Adjective) : tough; solid, firm or stiff
sour (Adjective) : having a taste like a lemon

Correct Option: A

sweet (Adjective) : having a taste like sugar or a pleasant smell.
dulcet (Adjective) : sounding sweet and pleasant
dull (Adjective) : not interesting or exciting
hard (Adjective) : tough; solid, firm or stiff
sour (Adjective) : having a taste like a lemon

accusation (Noun) : a statement saying that you think a person is guilty of doing something wrong
indictment (Noun) : a sign that a system, society, etc. is very bad or wrong
revelation (Noun) : the act of making people to know about something ; disclosure
acquittal (Noun) : an official decision in court that a person is not guilty of crime
refusal (Noun) : the act of refusing

Correct Option: D

accusation (Noun) : a statement saying that you think a person is guilty of doing something wrong
indictment (Noun) : a sign that a system, society, etc. is very bad or wrong
revelation (Noun) : the act of making people to know about something ; disclosure
acquittal (Noun) : an official decision in court that a person is not guilty of crime
refusal (Noun) : the act of refusing