Common Error Detection MCQs

Find out whether there is any grammatical error in below sentence.
The retiring principal asked his old pupils / to take the interest in the school / after he has retired.

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We / have been living / in this house / since two years.

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I fail to understand / why he replied in negative / when the proposal was in his favour.

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Nitin's nephew, who lives / in Bangalore, is eager to travel to / Delhi to have / a glimpse of the capital.

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Another reason for pharmaceutical companies beefing up their / OTC (Over the Country) divisions is that prescription drugs with proven safety records which have been reached / the end of the their patent protection periodare

Find out whether there is any grammatical error in below sentence.
Due to certain inevitable circumstances / the scheduled programme had to be / postponed indefinite / but the members could not be informed.

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Our conception of / what should a science of mental life be / has changed considerably since James' time.

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The number of marks carried by each question / are indicated / at the end of the question

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A leading textile manufacturer, one of the fastest growing in the industry / is looking for a marketing manager / to look up the marketing network of the company