I wear a colorful wrapper, but I never spit rhymes. Kids collect me in buckets on Halloween night, and I come in sweet bars or hard bites. What am I?

I am full of keys but unlock no physical doors, solving complex math homework when a student's brain gets tired. What am I?

Which month of the year has the most nervous people?

Why is a book always cold in the winter?

I have three leaves, or four if you are lucky, and I grow in the grass. What am I?

I am filled with single letters like A, B, C, and D, yet I tell no stories. Instead, I tell your parents how well you performed in class. What am I?

I have a neck but no head, and I love to wear a cap. What am I?