Language points 

（Attention：The following points are not covered by the video. It is better for you to watch the video or listen to the MP3 first and try to take notes on your own. Then you may check here to get more details. ）

1, Most funny stories are based on comic situations.

 be based on:以......作为基础

It was difficult not to be tempted新概念作文一等奖

Stem from, come from, arise from, originate from

His feeling of hate stems from envy

Her interest in flowers stemed from her childhood in the country

come into fashion 开始流行

come into being  开始形成

come into power 开始执政