Choose the correct words to fill the blanks: “The story books which my teacher ______, ______ very interesting.”

Correct answer: Recommended, are. “Books” is plural, so the main verb must be “are”, and “recommended” fits the relative clause.

• Recommends, is: “Is” does not agree with the plural “books”.
• Recommended, was: “Was” does not agree with the plural “books”, and the sentence is stated in the present.
• None of these: “None of these” is incorrect because the third option is correct.