题目内容：

 用括号内所给词的适当形式填空，使短文意思完整

This is Mr Green’s family tree. Mr Green’s 1. (parent) are very old. His wife is 45 years old. They 2. (have) a son and a daughter. 3. (they) son and daughter are students. Mr Green has a younger brother and they 4. ( work) in the same factory. They are 5. (worker).