Cheatsheet: Grammar Sentence Correction | IBPS PO Prelims & Mains Preparation - Bank Exams PDF Download

There is a comparison between people of Japan and people of America. Since the comparison is between plurals, “those of” will be used instead of “than of” which is used with singular. 

Must should be followed by a verb in simple present. Hence, the answer should be "must see".

The sentence is in the past tense, indicated by the verb "to be." The correct form of "to be" in the past tense for "he" is "was." Additionally, the continuous form of the verb ("being") is needed to describe an ongoing action in the past. Therefore, the correct phrase is "was being." The sentence should read, "He was being positively rude."

The phrase 'added another feather to his cap' is an idiom that means to accomplish something noteworthy, adding to one's reputation or list of achievements. The most accurate improvement is 'made a significant achievement' because it directly reflects the idiomatic meaning. The other options do not capture the sense of having achieved something notable.
Therefore, option e is correct.

The sentence is in past progressive passive form and hence being is used with the past participle.