Exercise 19 1. a. cooperation b. cottage c. column d. conscious 2. a. passage b. pass c. contact d. glassware 3. a. illegible b. level c. metal d. illegal 4. a. prone b. promote c. alone d. profit 5. a. sunlight b. sunlit c. brightness d. mind 6. a. ghost b. ginger c. gust d. guilt 7. a. union b. uniform c. rumour d. university 8. a. zoology b. zipper c. zone d. pizza 9. a. urinate b. urgent c. urban d. urge 10. a. unify b. appetite c. magnify d. utility Exercise 20 1. a. cure b. tutor c. sure d. pure 2. a. diving b. discover c. discipline d. divide 3. a. cinema b. diner c. ninth d. wine 4. a. strives b. states c. stays d. studies 5. a. sour b. count c. amount d. tourism 6. a. gull b. bull c. dull d. skull 7. a. pool b. soon c. stood d. shoot 8. a. luxury b. example c. exist d. exempt 9. a. killed b. cured c. crashed d. waived 10. a. thing b. thought c. though d. thumb Exercise 21 1. a. rough b. sum c. utter d. union 2. a. noon b. tool c. blood d. spoon 3. a. chemist b. chicken c. church d. century 4. a. thought b. tough c. taught d. bought 5. a. pleasure b. heat c. meat d. feed 6. a. chalk b. champagne c. machine d. ship 7. a. knit b. hide c. tide d. fly 8. a. put b. could c. push d. moon 9. a. how b. town c. power d. slow 10. a. talked b. naked c. asked d. liked