Which one is the correct sentence?

1.Which expression is correct?

2.They elected him chairman. Its passive form is :

3.Choose the correct sentence :

4.A decade ¾ since the discovery of Leprosy vaccine. The right option for the gap is:

5.From your point of view, which sentence is incorrect?

6.Salam is late for office on most days. In other words, he is ___ late for office.

7.Who is a netizen?

8.We are looking forward to ¾ soon. The right expression for the gap is:

9.He is an innovative teacher. Here '$innovative^{\prime}$ means:

10.He went mad. This verb is :

11.Which one is the correct spelling?

12.He said, “where are my glasses?” Its indirect form is: