Answer: Option A. -> I am interested in it.
Answer: (a)It interests me. (a) I am interested in it. (Correct) (b) I was interested in it. (Tense has changed) (c) I will be interested in it. (Tense has changed) (d) I have been interested in it. (Tense has changed)

Answer: Option C. -> Let this be done by me.
Answer: (c)

Answer: Option B. -> A perfect dam has been built by the beavers across the stream.
Answer: (b)

Answer: Option A. -> A probe has been demanded into the destruction of evidence.
Answer: (a)Political parties have demanded a probe into the destruction of evidence. (a) A probe has been demanded into the destruction of evidence. (Correct) (b) A probe is been demanded into the destruction of evidence. (Tense has changed) (c) A probe has been demanded the destruction of evidence. (preposition is missing) (d) A probe has been demand into the destruction of evidence. (Third form of the verb not used)

Answer: Option A. -> Was the online batch joined by ten students from Jammu today?
Answer: (a)Did ten students from Jammu join the online batch today? (a) Was the online batch joined by ten students from Jammu today? (Correct) (b) Was the online batch join by ten students from Jammu today? (Incorrect verb) (c) Was the online batch joined by ten students in Jammu today? (Incorrect Preposition) (d) Has the online batch joined by ten students from Jammu today? (Incorrect tense)

Answer: Option C. -> Let the game be finished.
Answer: (c)Finish the game. (a) Let the game finish.(meaning has changed) (b) The game should be finished (Incorrect structure) (c) Let the game be finished (Correct) (d) The game had to be finished (Meaning has changed)

Answer: Option B. -> I was soon found by his lord-ship to be unfit for the service
Answer: (b)

Answer: Option B. -> Was I felt to be lying by him?
Answer: (b)Did he feel I was lying? (a) Was I feel to be lying by him? (Third form of the verb not used) (b) Was I felt to be lying by him? (Correct) (c) Was I felt to be lied by him? (Incorrect word used) (d) I was felt to be lied by them.(Not an interrogative sentence)

Answer: Option A. -> More than ten kilometres have been cycled by us.
Answer: (a)We have cycled more than ten kilometres. (a) More than ten kilometres hav e been cycled by us. (Correct) (b) We have been cycling for more than ten kilometres.(Incorrect subject) (c) More than ten kilometreshad been cycled by us.(Tense has changed)(d) More than ten kilometres have been cycle by us (third form of the verb not used)

Answer: Option B. -> A fox was caught by the tiger.
Answer: (b)