The most appropriate option to fill in the blank is:looking out
The sentence should be: "I am always looking out for good books."
Explanation: - "Looking out for" means to be watchful or alert in search of something. - In this context, the speaker is expressing that they are always vigilant or actively searching for good books to read. - Therefore, "looking out" is the correct choice to fill in the blank.
- Looking out implies searching or keeping an eye out for something, which perfectly fits the context of seeking good books.
- Looking down suggests looking in a downwards direction, which isn't relevant to searching for books.
- Looking after can mean taking care of something, but it doesn't capture the act of searching for new books.
- Looking into might be used for investigating something specific, but "looking out" is a more general expression for actively searching.
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