do what they can__the old museum from__a to preserve ,being destroyd b prevent .being destroyed为什么不选b呢

what do they do? what do they do they They shall do what 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 what do they do?(工程师) what()they()they()there?what()they()they()there?[do] What do they doing?是What do they like doing？ What can't they do　还　 what they cant do? What ___ do they like? What are they( )(do)now what will they do firt What do they like doing?