填空题 A have higher demands of museums
B are open to more people with different social background
C to lengthen their opening hours
D charge too little for admission
E have been built and open to public
F by lowering the admission fees

填空题 Now museums are no longer restricted to the privileged few, but______.

填空题 With the development of society, people, especially the young people,______.

填空题 To meet the needs of society, more museums______.

填空题 Two major problems for museums are that they have too many visitors and they______.