Chào bạn! Theo mình thì đáp án là:
1. spent
2. didn't spend
3. lent ( lend - lent - lent )
4. built ( build - built - built )
5. sold ( sell - sold - sold )
6. Did you tell...?
7. bore ( bear - bore - borne )
8. tore ( tear - tore - torn )
9. wore ( wear - wore - worn )
10. swore ( swear - swore - sworn )
11. crept ( creep - crept - crept )
12. slept ( sleep - slept - slept )