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Complete the tag-questions.
1) Reading is a very useful way to spend your free time,
__________________?
2) Libraries were equipped with computers many years ago,
__________________?
3) You can't find encyclopedias or reference books in libraries,
__________________?
4) The invention of printing changed the history of mankind,
__________________?
5) You may not consult the librarian about the books,
__________________?
6) People usually don't choose books for reading,______________?