Multiple choice english-grammar-course mh-grammar-ch19 Which of the following pairs are ANTONYMS? Commence - Begin Luminous - Radiant Expand - Contract Rapid - Swift Reveal answer Fill a bubble to check yourself C Correct answer Explanation 'Expand' means to grow larger, while 'contract' means to become smaller—these are opposites on the same scale of size or volume. The other pairs are all synonyms.