Which one is singular form?

1.Choose the right part of speech of the underlined word: His answer was a decided no.

2.Complete the sentence : Beware of that wolf ¾

3.Complete the sentence: The inquiry has brought ___ many interesting facts.

4.What is the plural form of the word '$crisis^{\prime}$ ?

5.He suffered from the ____ that he was another Napoleon.

6.In my opinion, she should have resigned earlier. The underlined word is/an-

7.Which one is correct?

8.'This is an exception ____ the rule.

9.'$Arsenal^{\prime}$ means-

10.This climate is not congenial ____ my health.

11.Which one is correctly spelled?

12.The aircraft has our emergency exits. Here '$exits^{\prime} is$ a/an-