Queues - General Questions

Starting with an empty queue: enqueue(7), enqueue(2), dequeue(), enqueue(3), dequeue(), dequeue(), enqueue(2). Which element is at the front?

Starting with an empty queue: enqueue(3), enqueue(7), dequeue(), dequeue(), enqueue(9), enqueue(3), dequeue(). Which element is at the front?

Breadth-first search uses a:

Starting with an empty queue: enqueue(1), enqueue(4), enqueue(4), enqueue(8), enqueue(4), enqueue(3), dequeue(). Which element is at the front?

Starting with an empty queue: enqueue(4), dequeue(), enqueue(5), dequeue(), enqueue(9), enqueue(2), enqueue(7). Which element is at the front?