In this excerpt from “A Bird Song” by Christina Georgina Rossetti, which three lines contain internal rhyme?

It's a year almost that I have not seen her:
Oh, last summer green things were greener,
Brambles fewer, the blue sky bluer.
It's surely summer, for there's a swallow:
Come one swallow, his mate will follow,
The bird race quicken and wheel and thicken.