an open book: can easily understand and know everything about somebody

Your health secrets will be an open book to anyone who can do an online search.

The best option is one that held no secrets.

to keep up : to continue to be in contact with somebody

He couldn’t keep up with his friends who went into business.

The best option is to keep in touch.

to give him a piece of my mind : to tell somebody that you disapprove of his behaviour or angry with him

I’ve had enough of Raju. I'm going to give him a piece of my mind.

The best option is to reprimand him.

red-letter day : an important day, or a day that you will remember, because of something good that happened then.

15th August is a red-letter day in the history of India.

The best option is happy and significant day

have the last laugh : to make someone who has criticized or defeated you, look stupid by succeeding at something more important

They fined her last year but she had the last laugh because she was taken on by her rivals at once.

The best option is to be victorious at the end of an argument.

on the level : honest; legal; above board

Example :

• You can trust Shivam.
• He is strictly on the level.

The best option is honest and sincere.

made ducks and drakes of : to squander; to waste

Ritesh made ducks and drakes of the vast property he had possessed.

The best option is squandered

went to the winds : to be dissipated; to be utterly lost

All his hard work and sincerity went to the winds when he failed to achieve the target.

The best option is dissipated

• on the verge of : very near to the moment when somebody does something or something happens
• brink : in a very new, dangerous or existing situation; the extreme edge of land.
• outset : at/from the beginning of

Sara was on the verge of tears when she heard the news.

The best option is on the brink of.

to face the music : to expect or deal with criticism or punishment for something you have done

He is prepared to face the music for his conduct at the meeting.

The best option is to bear the consequences

at a snail’s pace : very slowly

Things are moving at a snail’s pace, but we’ll finish on time.

The best option is very slowly

no love lost between : do not like each other

There is no love lost between them.

The best option is not on good terms.

to be always at his beck and call : always ready to obey somebody’s orders

There were a dozen of maids and waiters at our beck and call.

The best option is at his disposal.

in the long run : concerning a longer period in the future

He realized that in the long run, their argument wouldn’t seem so useless.

The best option is ultimately.

in the good books : used for saying that somebody is pleased with you 

I cleaned the bathroom yesterday. So, I’m in mum’s good books .

The best option is in favour with the boss.

by leaps and bounds : rapidly; very quickly

India is progressing by leaps and bounds.

The best option is very quickly

the pros and cons : arguments or considerations for and against something; advantages and disadvantages

We will discuss all the pros and cons before we decide to add a new wing to the library.

The best option is consider all facts.

got the sack : dismissed from a job 

Ravi got the sack today. He is always late.

The best option is was dismissed from.

• to carry out : to do and complete a task
• execute : to do a piece of work

The clerk was asked to carry out the order as quickly as possible.

The best option is execute.