Unit 1 abnormal--apt Unit 2 arc--blunder Unit 3 blunt--chaos Unit 4 characterize/-ise--concession Unit 5 concise--cynical Unit 6 damn--displace Unit 7 disposition--engagement Unit 8 enhance--flee Unit 9 fling--grim Unit 10 grin--incidence Unit 11 incidentally--judicial Unit 12 junction--mechanism Unit 13 medal--obligation Unit 14 obscene--perplex Unit 15 persistent--proposition Unit 16 prose--refreshment Unit 17 refuge--sculpture Unit 18 seam--spectrum Unit 19 speculate--swap Unit 20 symmetry--tuck Unit 21 tug--ward off