1) Stephen Alvarez is a caver. He travels the world exploring and photographing caves. He ____________ to climb mountains to reach some caves or dive deep down to search for underwater caves. a) used b) has c) is d) was 2) He has photographed some very impressive caves including the longest in the world, Mammoth Cave in the USA, __________ has 580 kilometers of tunnels. a) where b) which c) who d) when 3) People sometimes ask Alvarez _______ caving is dangerous. a) as b) even c) if d) though 4) Cavers carry the right _____________ for all situations. a) dress b) costume c) outfit d) equipment 5) Knee pads and gloves are important, and they must wear a ___________ to protect the head. a) cap b) helmet c) scarf d) hoodie 6) Decorations in the cave come in many forms. But Alvarez says there are many __________, including some that look like popcorn and some that look like a nest of eggs a) amounts b) other c) also d) others 7) Beautiful decorations are not all that you'll see in the caves. Animals live in caves, too. Many of __________ are eyeless. a) these b) this c) their d) that 8) Explorers like Alvarez know how important it is to ______________ caves. a) save b) protect c) rescue d) defend 9) A ___________ caver can destroy in minutes what took thousands of years to form. a) casual b) messy c) careless d) care 10) That's ____________ responsible cavers say, "Take nothing but pictures. Leave nothing but footprints. Kill nothing but time!" a) how b) because c) why d) so

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