Could you tell me which one is right between 'is' and 'are' in the following sentence? Thank you in advance.<br/><br/><i>1. Who [<u><b>is/are</b></u>] A, B, and C?</i><br/><i>2. Write down the opposite [<b>word/words</b>] <i>in the blanks </i>for each of the following words. </i>