The subject ?The teacher? is singular, hence ?was taken? will be the correct expression. Since the teacher was herself taken to the hospital so b and c are incorrect.
Here ?widely-ranged? is the correct expression of the adverb, and it qualifies the verb discussions.
Two complete events occurred rescue happened first hence it will be expressed in past perfect tense, ?had rescued? will be the correct usage.
No improvement required. Grant means to permit as a favor. As the interview will be a favor the use of Grant is correct.
As the task was completed by 8 am the sentence is in past perfect tense, ?had written? will be the correct use.
?ought? represents advice, ?would? represents strong possibility of an event here. ?would have? will be the correct grammatical expression here. The sentence expresses that the accused was not sent to jail because of one witness.
?Looking for? means ?trying to find?, hence it?s the correct use here. Looking about means looking here and there. Looking after means taking care of something or someone. Looking into means looking into the depths of something.
?Abide? means ?to put up with?. ?abide? is always followed by the preposition ?by?.
The event of living in Chennai is over long back, hence the sentence is in past perfect tense. ?had lived? will be the correct expression.
The given sentence is in simple past. No improvement required.
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