After reading it, 300 words are in the fifth grade.

Role: an old man who grows melons and a watermelon thief.

Time: A hot summer day.

Watermelon: We are big watermelons, we are ripe, we are ripe.

Old man: This watermelon is ripe, and people come to steal it every day. It's really worrying. I have to think of a way.

After the old man left, a thief came. )

Thief: I am a big badger. Laziness is my best skill. I heard that the watermelons here are ripe, so I came here to pick them.

Watermelon: Neither of us is ripe.

Thief: Yes, both watermelons are ripe. I'll take them home first.

Just as the thief was happy, the old man came. )

Old man: thief, dare to steal watermelon! So you steal watermelons every day.

The old man caught the thief at once. )

Watermelon: We are saved!