Answer:
I am a rodent that people sometimes keep as pets. I love cheese and have a long tail. What am I?
How a big, hibernating mammal would show affection.
A dark-colored creature serenaded by Lennon and McCartney.
Known for their natural tuxedos and marching.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I'm best when I am toast.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.