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Chọn đáp án đúng và giải thích tại sao lại chọn đáp án đó (Giải thích 3 4 câu thôi cũng được ạ, mình cảm ơn nhiều)
From the start of his career as a writer, Mark Twain was fascinated with inventions. As a result, he chose to spend much of his available income/ on various types of inventions, generally without much success. In fact, he lost most of the money he invested. By 1887, the 49-year-old author had invested most of his money in one project, the Paige typesetting machine.

Twain expected the Paige machine to be completed in 1889. Unfortunately, the machine was never completely finished, and by the early 1890s, Twain knew he was in a serious financial situation. He worked hard to take care of his problems/ by producing a number of books in a row. He wrote A Connecticut Yankee in King Arthur's Court (1892), An American Claimant (1892), Tom Sawyer Abroad (1893), and Pudd'nhead Wilson (1894). However, all of these works did not solve his financial problems, and he was forced to declare bankruptcy.
 

1. This passage mainly discusses how an author_______.

A. invested poorly in inventions B. wrote so many books

C. created his famous works D. created a successful invention

2. According to the passage, what interested Mark Twain?

A. giving investment advice B. work as a typesetter

C. the world of banking D. new ideas and products

3. Where was the majority of Twain's money in 1887?

A. in a bank account B. invested in various inventions

C. invested in one invention D. invested in his writings

4. It can be inferred from the passage that the Paige machine was_______.

A. created by Mark Twain B. ready in the 1890s

C. close to being completed D. a great success

5. Look at the expression "in a row" in paragraph 2. This expression could be best replaced by_______.

A. one after another B. very quickly

C. on time D. in a straight line