On January 1, 1901, the Commonwealth of Australia was born out of ______ early colonies.

单项选择题______ was famous for his Essays.

单项选择题Jane Eyre is well-known figure created by ______.

单项选择题Which of the following does NOT characterize a normal patent

单项选择题A dead patent is one that ______.

单项选择题An inventor can generally make a big profit if he ______ his or her invention.