How many such pair(s) of letters are in the word

The road accident led to his loss of memory.

High level security arrangements were made for the forthcoming visit to a Japanese Prime Minister. 

This marks the second time the pandemic has forced a postponement over the 12th Ministerial Conference.

My younger brother and sister help me over my work  

Tom is the tallest and the most intelligent between the three siblings.

Of the four given options, choose the most appropriate one.

It is all a figment of your imagining.

‘Did you brought your drawing books?’ the teacher asked the students.

When one thinks of purely short-term gains, one is likely to shoot from the hip , to act in anger, and to react in anger.