1. The detective left no stone unturned to trace the culprit.
Option “D” is correct.
left no stone unturned: try every possible course of action in order to achieve something.
2. The authorities took him to task for his negligence.
Option “D” is correct.
took him to task: to criticize someone.
3. In spite of the immense pressure exerted by the militants, the Government has decided not to give in.
Option “B” is correct.
give in: to finally agree to what someone wants, after refusing for a period of time.
4. Their business is now on its last legs.
Option “B” is correct.
on its last legs: near the end of life, usefulness, or existence.
5. He went back on his promise to vote for me.
Option “A” is correct.
went back on: to fail to keep a promise, or to change a decision or agreement.
6. By the skin of one’s teeth
Option “D” is correct.
Meaning: barely manage to do something; narrowly succeed in doing something; manage to do something by the smallest margin.
7. Harp on
Option “D” is correct.
Harp on: to keep talking or complaining about someone or something.
8. To be at daggers drawn
Option “D” is correct.
To be at daggers drawn : in a state of extreme unfriendliness.
9. To get into hot waters
Option “D” is correct.
To get into hot waters: to be in or get into a difficult situation.
10. A fair crack of the whip
Option “C” is correct.
A fair crack of the whip: an equal chance to do something.
