what do they do?(工程师)

what do they do?(工程师) what do they do? what do your parents do?they are both ( ) 填工程师 怎么填? what do they do they what do they What do they what do they What do they need? what animals do they they/have/what/do/(?) what do they They shall do what they what do they do at the party what do they want to do? Do you what they should do? what do they do on weekends What do they do?哪里错了? what do they do 的同义句