复习:过去分词充当定语、表语 和宾语补足语
1. _______ (污染的)air and water are harmful to people’s health. 2. The problem ______________________ (在会议上讨论的) yesterday was very difficult to solve. 3. He became ______ (兴奋) when he heard he had won the first place in the competition.
Polluted
discussed at the meeting
excited