Which of the following should be avoided in official letter?

Choose the suitable word from the choices given to make the sentence meaningful.
 Don't _____ over the past.

A sonnet contains 

Select the correct option.
 Mary is _____ than her sisters.  

Identify the word in which the end sound is different from the other words.

The first sound in the word 'yes' is transcribed as 

Passage:  First of all, I need work, and a decent wage for my work. Aristotle defined happiness. not as a sum of pleasures, but as unimpeded activity. I want work which is hard but interesting. I am exceptionally lucky because I can choose my own work to a large extent. If I want respite from science I can go and be a war correspondent, or write children's stories or make political speeches.
 I require friendship. Particularly I require friendship of my colleagues and comrades in scientific and political work. I want the society of equals who will criticize me, and whom I can criticize.

Conjunction in sentence 3 is 

Choose the correct option in Hindi for the given word.
 Deadlock