In the sentence below, there is one underlined word and one gap. From the list of words lettered A to D, choose the one that is most nearly opposite in meaning to the underlined word and that will, at the same time correctly fill the gap in the sentence. Only question one is compulsory; therefore, the rest are .....
A. easy B. clear C. confusing D. optional
Correct Answer: D
Explanation
compulsory; required by law or a rule; obligatory. optional; available to be chosen but not obligatory.
