Fill in the gaps using tag questions.
(i) You've never seen anything quite like this,_____
(ii) The intricacies of quantum mechanics can be mind-blowing,______
(iii) With the economy in such a fragile state, we must be cautious,______
(iv) Solving this mathematical puzzle requires deep analytical thinking,______
(v) This artistic masterpiece defies conventional interpretation,_______
Explanation: 
