\[\boxed{\mathbf{1.}}\]
\[\angle AOM = 90{^\circ}\]
\[\angle AON = 120{^\circ}\]
\[\angle AOP = 150{^\circ}\]
\[\angle BOL = 120{^\circ}\]
\[\angle BOK = 150{^\circ}\]
\[\boxed{\mathbf{2.}}\]
\[\angle CAD = 25{^\circ}\]
\[\angle MLK = 55{^\circ}\]
\[\angle OPK = 120{^\circ}\]
\[\angle CEF = 140{^\circ}\]
\[\boxed{\mathbf{3.}}\]
\[1)\ \angle AOB = 70{^\circ}\]
\[2)\ \angle AOB = 150{^\circ}\]