I was totally baffled _____ Nina's behaviour.

1.The main idea of the passage is-

2.I believe books will never disappear. It is impossible for it $\to$ happen. Of all mankind's diverse tools, undoubtedly the most astonishing are his books. All the others are extensions of the body. The telephone is a extension of his voice, the telescope and microscope are extensions of his sight, the sword and the plough are the extensions of his arms. In Caesar and Cleopatra, when Bernard Shaw refers $\to the Library of$ Alexandria, he says it is mankind's memory. Humanity's vigils have generated infinite pages of infinite books. Mankind owes all that we are $\to the written$ word. 'Humanity $vigils^{\prime} refer \to-$

3.He fell

4.We must start an inquiry ______ the cause of the accident.

5.We have postponed ______ anyone the news until after Eid.

6.The charge for ______ excess luggage is Tk. 600 per kilo.

7.We didn't spend ______ money.

8.Don't worry, you can ¾ me. I'll do the job for you.

9.Well done! _____ the good work.

10.I can't quite ¾ out what the sign says.

11.If cigarettes were banned, life ______

12.Who is the speaker?