UNIT 1 abandon—alternative 1
UNIT 2 altitude—auxiliary 24
UNIT 3 avail—cash 44
UNIT 4 cast—confession 74
UNIT 5 confidence—credible 98
UNIT 6 credit—distinction 118
UNIT 7 distinguish—excellent 139
UNIT 8 excess—friction 161
UNIT 9 frown—hysterical 184
UNIT 10 identical—intervention 214
UNIT 11 intimacy—melt 234
UNIT 12 memorial—occurrence 262
UNIT 13 odd—phenomenon 283
UNIT 14 pierce—proof 304
UNIT 15 propel—refugee 327
UNIT 16 refund—sale 351
UNIT 17 salute—sober 375
UNIT 18 sociable—subjective 402
UNIT 19 submerge—thoughtless 427
UNIT 20 thread—valid 450
UNIT 21 valuable—zone 475