17.用所给词的适当形式填空。2.Liu Jing is a _____(nine) grade student who

17.用所给词的适当形式填空。
2.Liu Jing is a _____(nine) grade student who wants to be a doctor.
3.He now has sixteen bikes ____(fix) up and gives them away to children who don't have bikes.
4.When we're unhappy, we don't do ____(good) at school and we make our friends and family ____(happy).