2.When someone( )（短语），they gradually change from beging a ch

2.When someone( )（短语），they gradually change from beging a child into being an adult.
3.A ( ) is a person whose iob is to prepare and cook food,especially in someone's home or in an institution.
4.A ( ) is someone who has a degree in medicine and treats people who are sick or injured.
5.A（AN）____is a person who uses scientific knowledge to design construct，and maintain engines and machines or structures such as robots，railroads，and bridges.
填空并且翻译。