Supply the correct form of the words in the brackets to complete the sentences below.
1. He fell off his bike, but his . injury. . were not serious. (injure)
2. The shop . .assistant . showed me a lot of new models. (assist)
3. You shouldn't talk about her characters only through her . appearance . (appear)
4. She felt alone and . .friendless .(friend)
5. We need to get more young people . interested. . in the sport. (interest)
6. The knife is . .useless . , it can't cut anything. (use)
7. Bell . . successfully. demonstrated his invention. (success)
8. . .Unluckily . the barber cut my hair too short. (luck)
9. Nam is very . sociable. .kind and generous. (social)