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.

According to Aristotle, happiness is 

 ' Achilles heel ' means- 

Choose the appropriate article given in the options:
 Neil Armstong was ______ fast man to walk on the moon.

Which one of the following is the correct meaning of -
 That which cannot be heard.

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.

Select the correct direct form of the given sentence.
 She asked me why I had been smoking that day.

Which of the following structures of a question is correct?