THREE RHYMING RIDDLES

1)
Round as a well,
No deeper than a cup;
All the world's oceans
Can't fill it up.

2)
I go around in circles,
But always straight ahead;
Never complaining,
No matter where I'm led.

3)
I'm the monarch of shovels.
I have a double.
Thin as a knife,
Yet I have a wife.

Answers:
1. A sieve
2. A wheel
3. The king of spades in a deck of cards