当电路中的保险丝被烧断时，你应采取的措施是     (      )

A：Hey, Gretel! What can you see on the____? Can you see any bread?

B：No, Hansel．

A：That's too bad．We can't find the pieces of bread．We might be lost．

B：What should we do, Hansel?

A：Take it easy! Be ____! Listen! What can you hear?

B：I can hear a bird's ____．

A：Yeah! The bird ate our bread．____it and then we might find our way．

B：You mean the bird will ____us through the forest．

A：I think so．

B：Great! Let's go!

请回答下列问题：

计算：(－2a²)³÷(2a²)，结果是（    ）