单项选择题A.Seeing a film.B.Diving in the sea.C.Having a class.D.Doing an experiment.
填空题Mark Twain seemed unhappy in his later years because his wife and______ had died.
填空题Mark Twain became the most outstanding writer of his time because he knew his people and the Mississippi River very well, and he inherited from his mother ______.
填空题When Mark Twain became a miner in the frontier region, he started to write.
填空题During 1876 and 1889, Mark Twain wrote______ books for which he is most famous.