Blank 1 is unless but OA states B. Please change. @carcass

Thank you. Fixed.

However, the book has several mistakes. The OAs table reported B, D, and I as answers.

The explanation and the sense of the sentence tells us that the (i) Blank is C

Regards

When a terrier comes into the room, you instinctively draw away (i) _______ you want to be jumped at and greeted (ii) _______. But you make no such movement to protect yourself from a St. Bernard because you read, on sight, (iii) _______ the natures of these two from their external appearance.


For blank (iii), since the natures of the two types of person are different, the correct choice is "disparate", meaning different, diverse, or dissimilar.

For blank (i), the words "instinctively draw away" before the blank and "you want to be jumped at" immediately after the blank suggest a contrasting word, "unless" perfectly fitting in sense. The word "because" does not fit because, nobody instinctively draws away because he/she wants to be jumped at (doesn't make sense). Similarly, "nevertheless" also doesn't fit.

For blank (ii), the word "effusively", meaning "unrestrained" fits in to complete the sense carried by "unless" in the blank (i)

When a terrier comes into the room, you instinctively draw away (i) _______ you want to be jumped at and greeted (ii) _______. But you make no such movement to protect yourself from a St. Bernard because you read, on sight, (iii) _______ the natures of these two from their external appearance.


The second sentence "you make no such movement to protect yourself" suggest that you do so when you see a terrier. Thus the first part of the first sentence suggests you draw away to protect yourself. But the next part of the sentence "you want to be jumped and greeted" introduces the opposite sentiment. Therefore the contrasting word unless is the best choice for the first blank. And this contrast-shift will be meaningfully completed only if the form of greeting is enthusiastic. That is, only if you are greeted effusively. Greeted stoically or in a tractable way does not present the enthusiasm implied in "jumped at" and as the opposite of "drawing oneself away instinctively to protect oneself". And this contrasting behavior is the result of, you reading on sight the disparate natures of the two dogs from their external appearance.

The words are unless, effusively and disparate.