Which activity that you do in during your free time?

He (1) __________ to climb mountains to reach some caves or dive deep down to search for underwater caves.

He has photographed some very impressive caves including the longest in the world, Mammoth Cave in the USA, (2 )__________ has 580 kilometres of tunnels.

People sometimes ask Alvarez ( 3 ) __________caving is dangerous.

Cavers carry the right ( 4 ) __________ for all situations.

Knee pads and gloves are important, and they must wear a ( 5 )__________ to protect the head.

But Alvarez says there are many ( 6 ) __________, including some that look like popcorn and some that look like a nest of eggs.

Beautiful cave decorations are not all that you’ll see in caves. Animals live in caves, too. Many of ( 7 ) are eyeless. T

Explorers like Alvarez know how important it is to ( 8 )_________ caves. P

A ( 9 ) __________caver can destroy in minutes what took thousands of years to form.

A ( 9 ) __________caver can destroy in minutes what took thousands of years to form.

That’s (1 0 ) responsible cavers say, ‘Take nothing but pictures.

To means to be all around something or someone.

To means to damage something completely.

To means to catch someone or something.

To means to travel around an area to learn about it.

To means to move slowly along the ground on hands and knees.

 To means to move easily in one direction.