一、根据汉语提示完成句子
1．________(照相机) are a kind of important invention.
2．He made great ________(进步) in his study.
3．There are three ________(德国人) in the library.
4．I want to go to the ________(厕所)．Can you show me the way?
5．The old man has lived in Shandong ________(省) for a long time.
6．I have got a ________(迅速的) way to finish the work.
