TWO RHYMING RIDDLES

1)

Two brothers we are,
Great burdens we bear,
By which we are bitterly pressed;
The truth is to say,
We are full all the day,
And empty when we go to rest.

2)
There were four sisters ran a race,
And each did strive to set the pace;
But not one the other could overtake,
Although each tried great haste to make.

Answers:

1. Pair of shoes
2. Windmill