Parts of the following sentence are given as options. Identify the segment that contains a grammatical error. 

She has been working with me on this project from two years.

Select the most appropriate option that can substitute the bold segment in the given sentence.

Select the most appropriate meaning of the highlighted idiom.

Select the most appropriate option to substitute the highlighted segment. If no substitution is required select 'No substitution'.

Select the option that can be used as a one-word substitute for the given group of words.

Select the most appropriate option that can substitute the underlined segment in the  given sentence.

I have been waiting from two hours.

Person who insists on adherence to formal rules or literary meaning

Many kids from rich families become obnoxious due to the upbringing and lavish lifestyle that they have had.

Cater

(i) The umpteen four-wheelers and six-wheelers maintained by the institutions cater to the needs of students.

Select the option that can be used as a one-word substitute for the given group of words/phrase.