説明書

A wave. 波乱 is upheaval; 電波 is a radio wave.

The sky, and heaven with it. 天国 is paradise; 天気 is the weather.

Lasting a long time. 久しぶり is what you say when you have not seen someone for a while.

Long life, and the celebration of it. The character on wedding envelopes and New Year food.