Which one is correct?

1.What is the synonym of the word "Acrobat"?

2.What is the antonym of the word "Evaporation"?

3.Choose the word that best completes the text. "People from all over the world are sent by their doctors to breathe the pure, ¾ air in this mountain region".

4.The humidifier in our laboratory ¾ working this morning.

5.Underlined portion in the sentence : "The guests arrived after sunset" is ¾.

6.In the sentence "I rather like the smell of petrol", rather is-

7.Choose the correct change of narration : Mother said to me, "I saw her".

8.Choose the word(s) which best expreses the meaning of "At a stretch".

9.Which following word has an opposite meaning to the word "Chilly"?

10.'$Prairie^{\prime}$ means–

11.He advised me$\ldots\ldots.smoking.$

12.Choose the appropriate meaning of the idiom 'swan $song^{\prime}.$