1. (pollute) air and water can be harmful to people’s health.
答案:Polluted
2.Don’t use words,expressions,or phrases (know) only to people with specific knowledge.
答案:known
3.The wolf said in a (frighten) voice and the old man felt (frighten).
答案:frightening;frightened
4.They were very (interest) in the novel written by Mo Yan.
答案:interested
5.This is one of the teaching buildings (build) last year in our school.
答案:built
6.The woman is an (experience) worker because she has been working in this field for 20 years.
答案:experienced
7.She likes to drink cold (boil) water in summer.
答案:boiled
8.Hearing his poor exam results,his parents were very (disappoint).
答案:disappointed
