深的

• dog

• deep

• death

• deer

volcano

• 
• 
• 
• 

learn

• 努力

• 放棄

• 學習

• 失去

容易的

• easy

• ear

• elephant

• eight

The earth seems to keep a lot of secrets.

That's ____.
No, I mean it.

Luckily, scientists are _____ing new things

every day.

But there are no ____ answers.

Maybe your questions are too hard!

We see ________ erupt.

But we don't really know why.

Yeah, and we never know when earthquakes

will happen.

 

• vole

• volar

• volery

• volcano