IDIOMS

E.g.- No matter how hard he tries to be organized, his desk is always a mess. A leopard can't change his spots.

For ex:- Living in the city during the week and spending weekends in the countryside gives me the best of both worlds—urban excitement and peaceful nature

E.g.- Work from home offers the best of both worlds because you can be productive and also spend time with your family.

Example - After losing his job, he found himself living on the breadline, struggling to make ends meet.

Example :- At the party, it was clear that the group of artists were birds of the same feather, all sharing similar creative passions and ideas.

Example:- She felt left out in the cold when all her friends made plans without including her

E.g.- The new student was left out in the cold at lunch.

• The given sentence states that the project on which I was working for the last two months has failed and we are back to square one.
• Hence, 'back to square one' is the most appropriate answer.

Example:- His jokes always crack me up; I can't stop laughing whenever we're together!

E.g.- I bumped into my childhood friend while on vacation in a remote village. What a small world!