This scooter is not efficient as it used to be instead it is still a very useful machine ........

English Language (Defence) Sentence Improvement

Directions for the following 25 (twenty-five) items : Look at the underlined part of each sentence. Below each sentence are given three possible substitutions for the underlined part. If one of them (a), (b) or (c) is better than the underlined part, indicate your response on the Answer Sheet against the corresponding letter (a), (b) or (c). If none of the substitutions improves the sentence, indicate (d) as your response on the Answer Sheet. Thus a “No improvement” response will be signified by the letter (d).

This scooter is not efficient as it used to be; instead it is still a very useful machine.

similarly

furthermore

nevertheless

No improvement

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Explanation:

‘Instead’ is used as an alternative or substitute and is not relevant in this context. ‘Nevertheless’ will be used as it means ‘inspite of that’.
Thus, the correct formation would be, ‘This scooter is not as efficient as it used to be; nevertheless it is still a very useful machine.’