Answer:
Mary and I <u>am</u> (are) best friends and we have learned English with each other <u>since</u> (for) half a year. Both
of us <u>is</u> (are) highly interested in learning this language due to a number of factors. First of all, learning
English <u>enable</u> (enables) us to understand masterpieces from English speaking countries such as books, <u>movies</u> (add comma) and music. Although Mary is always <u>complain</u> (complaining) that some English grammar structures are too <u>difficultto</u> (difficult) remember, she is always making<u> </u> (a) great effort to learn the language. She often goes to the library to borrow English written books. By now, Mary is reading up to 5 books in English. I <u>am preferring</u> (I prefer) watching movies to reading books. Sometimes, we <u>are talking</u> (talk) with each other in English and share about the books or movies we have just <u>enjoy</u> (enjoyed).
The speaker in "The Tyger" is D, an adult.
I believe the correct answer is naive.
The author is trying to say that he was ignorant, and that he couldn't understand properly these new revelations. He was either too young or too stupid to understand such a thing, but he believes he will as he grows older.