PROBABLE
(a) Certain
(b) Indefinite
(c) Likely
(d) Temporary

ADHERE
(a) Act reluctantly
(b) Give allegiance
(c) Waver frequently
(d) React promptly

INFER
(a) Conclude
(b) Calculate
(c) Debate
(d) Suggest

HESITATE
(a) Afraid to talk
(b) Unwilling to act
(c) Unwilling to speak
(d) Unable to decide quickly

EXPLICIT
(a) Immediate
(b) Plainly stated
(c) Marked
(d) Revealing the secret

SUFFICIENT
(a) Adequate
(b) Complete
(c) Full
(d) Frugal

REPRESS
(a) Express
(b) Impress
(c) Curb
(d) Confuse

VINDICTIVE
(a) Cruel
(b) Harsh
(c) Revengeful
(d) Rude

He disdained to notice the insult.
(a) was very proud
(b) refused
(c) was unhappy
(d) was too reluctant

He gave an evocative rendering of his recent poems.
(a) thrilling
(b) enchanting
(c) emotional
(d) incantatory

Expeditious steps should be taken to complete the work in two weeks.
(a) unmerciful and punitive
(b) strict and forceful
(c) disciplinary
(d) prompt and efficient