书架上有很多书。
There are many books on the ___bookshelf.
这个书架上的书籍种类繁多。
This ___bookshelf holds a wide variety of books.
图书馆里摆满了书架。
The library is filled with ___bookshelves.
请把这本书放回书架。
Please put this book back on the ___bookshelf.