Fill in the blank in the sentence given below by choosing the correct option:
You should be sure that he won’t ________ his word.

Correct option is B

Correct option: (b) go back on
Meaning & why it fits (in detail):
• go back on (one’s word/promise) → to fail to keep a promise; to break one’s word (Hindi: वादे से मुकर जाना / बात से पलट जाना)
• Sentence meaning: You should be sure he will not break his promise.
Correct sentence: You should be sure that he won’t go back on his word.
Meanings of other options (in detail):
• (a) put up with → tolerate; सहन करना (Hindi: सहन करना)
• (c) put out of → cause to be out of; remove from a state/condition (commonly: put out of action/put out of business) (Hindi: से बाहर कर देना / निष्क्रिय कर देना)
• (d) run away with →
– to steal and take away (Hindi: चुरा कर भाग जाना) OR
– to be carried away by feelings (Hindi: भावनाओं में बह जाना)
Hence, option (b) is the correct answer.