核问题

• 木(tree; wood)RADICAL
• 亥(pig (12th zodiac sign))PHONETIC

The kernel of a tree fruit (木) sounds like the character for pig (亥).

• 門(gate; door)PHONETIC
• 口(mouth; opening)RADICAL

Standing before a gate and calling out with your mouth is asking.

• 是(be; correct)PHONETIC
• 頁(page; head)RADICAL

A heading is the top part of a page that clearly states what the content is about.