If $A=\{1,2,3,4\},B=\{3,4,5,6\},C=\{5,6,7,8\}$ and $D=\{7,8,9,10\}$; find
(i) $A\cup B$ 

(ii) $A\cup C$ 

(iii) $B\cup C$ 

(iv) $B\cup D$ 

(v) $A\cup B\cup C$ 

(vi) $A\cup B\cup D$ 

(vii) $B\cup C\cup D$

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