The key answer of exercise 2

a)

1. to come clean (about)
2. to make candid comments (about)
3. to overstate
4. to present an accurate picture (of)
5. to catch someone red-handed
6. to lose face
7. to gloss over
8. to show your true colours

b)

1. a) overdo → overstate ; b) photo → picture ; c) lose your face → lose face
2. a) candied → candid ; b) paint → gloss ; c) collars → colours
3. a) clear → clean ; b) red-footed → red-handed ; c) → ✓