Identify pairs of alternate angles, alternate exterior angles, and consecutive interior angles.

Here are the solutions to question 3:

a) One pair of alternate angles is $\angle AMN$ and $\angle MND$.
Another pair is $\angle BMN$ and $\angle MNC$.
Another pair of alternate exterior angles is $\angle AME$ and $\angle DNF$.
Another pair is $\angle BME$ and $\angle CNF$.

a) Answer: $\boxed{\angle AMN \text{ and } \angle MND}$

b) $\angle BMN$ and $\angle MND$ are consecutive interior angles (also known as co-interior angles). If the lines AB and CD are parallel, these angles are supplementary (add up to $180^\circ$), but