Directions: In the following questions, some part of the sentence is highlighted in bold. Which of the options given below the sentence should replace the part printed in bold to make the sentence grammatically correct? If the sentence is correct as it is given then choose option E ‘No Correction required’ as the answer.
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Option D can be immediately eliminated because the phrasal verb ‘deal in’ which refers to ‘buying and selling something’ is not appropriate in the context.

Option B is verbose as “first starting with the one” is a repetition which can be avoided with ‘starting with the first’.

In option C, usage of passive voice (which is dealt with) doesn’t make any sense and is hence erroneous. This eliminates option C as well.

Clearly option A must be the correct answer.
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Option A and B are erroneous because ‘can return’ and ‘returned’ are verb phrases which aren’t parallel with the gerund phrase ‘becoming bizarre’. Options A and B hence get eliminated.

Option D, though, takes care of the parallel structure yet deviates the meaning of the sentence. 

Option C is the perfect choice among the given ones and must replace the bold part to make it a grammatically correct sentence.

Option C is hence the correct answer.
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The sentence is absolutely correct and thus needs no improvement.

Option E is hence the correct answer.

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The adjective ‘tantamount’ which refers to ‘being essentially equal to something’ is generally followed by the preposition ‘to’ and not by ‘of’ or ‘with’. The correct expression is ‘tantamount to’.  This immediately eliminates options A and B.

Ex. His statement was tantamount to an admission of guilt.

Option C can be eliminated as well because the English language doesn’t have a word ‘tantamountly’.

Option D is the best choice among the available ones as in it the expression ‘tantamount to’ is followed by the gerund and thus forms a meaningful statement.

Option D is hence the correct answer.

The Indian Air Force has played a vital role in the nation’s defense and our glorious history is replete of numerous counts of valour and fortitude in the face of extreme odds.
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Replete (Adjective):
filled or well-supplied with something. The adjective is generally followed by the proposition 'with'.

Ex. Earth's climate system is replete with potential surprises.

full, loaded, crowded, abounding, etc.

Moreover, the noun 'account' refers to a report or description of an event or experience and its plural form 'accounts' should be used here in the context. 

Option B would hence make the best choice out of the given options. 

Hence, the option B is correct.