改被动句或主动句

改被动句或主动句
朋友们帮个忙将下面的句子改成被动语态或主动语态,谢谢!万分感谢!
1、Alice has shown us some of her pictures in London.
2、Are they building a new railway in the east of the town?
3、Radios and recorders have been taken the place of by MP3 and CDs.
4、Newspapers are being delivered to every house by the postmen.
5、His parents had always encouraged him to study a foreign language.
6、His Chinese instructor told him about the exchange student programme when he was a university student.
7、He hopes that a university in China will offer him a scholarship to study there someday.