Help with these two questions!!

Locate the verb shiver in Line 2. Which definition seems to fit this use?

1. to break into small pieces
2. to quiver or vibrate


Next one: Review the excerpt from Tennyson's "Lady of Shalott, then answer the question.

Willows whiten, aspens quiver,
Little breezes dusk and shiver
Thro' the wave that runs forever
By the island in the river
Flowing down to Camelot.
Four gray walls and four gray towers,
Overlook a space of flowers,
And the silent isle embowers,
The Lady of Shalott.

How many feet are used in each of the first 4 lines?
__ feet?