Which one is correct spelling?

1.Select the pair that express a relationship similar to that expressed in the original pair; Oxygen : Respiration

2.The antonym of '$advocate^{\prime} is \ldots\ldots..$

3.'We know that the earth is round.' The passive form of this sentence is-

4.Choose the correct sentence.

5.One should be careful about ¾ duty. Fill in the blank space with the appropriate choice-

6.Honesty is the best policy, Here '$Honesty^{\prime}$ is-

7.I'm worked against the clock to get the home-work finished before 10 p.m.- Here the underlined words express-

8.Fill in the blank with an appropriate preposition - 'Do not boast ¾ your $beauty^{\prime}.$

9.Choose the correct relative pronoun for the following sentence- 'I don't like stories ¾ have unhappy \end{ings}^{\prime}.

10.Choose an idiom instead of the underlined part of the following sentence- 'I think I'll just go upstairs and have a sleep for a while, if nobody $objects^{\prime}$

11.Fill in the blank : 'Give my ¾ $\to him^{\prime}.$

12.Choose the correct alternative to complete the sentence. He ¾ to see us if he had been able to.