You should read this novel — it's been ________ recommended by all the critics.  highly  fully  deeply  truly

Break Down the Problem

1. Identify the context of the sentence.
2. Determine the most appropriate adverb to fill in the blank.

Relevant Concepts

• Adverbs can modify verbs, adjectives, or other adverbs, providing more detail about how an action is performed or describing the extent of a quality.
• In this context, we need an adverb that intensifies the recommendation made by critics.

Analysis and Detail

1. Highly - This adverb indicates a strong degree of recommendation and is commonly used in the context of endorsements.
2. Fully - This adverb suggests completeness but doesn’t quite convey the intensity of the recommendation.
3. Deeply - While this word suggests a strong emotional response, it’s less commonly used to describe recommendations and may imply a personal connection rather than a professional endorsement.
4. Truly - This adverb conveys sincerity; however, it does not emphasize the strength of the recommendation clearly enough.

Verify and Summarize

After considering each option, "highly" is the most suitable adverb as it specifically strengthens the recommendation from critics.

Final Answer

You should read this novel — it's been highly recommended by all the critics.