Choose the correct answer. 

More and more ________ are very excited at discovering as many interesting things in the deserts as possible.

Choose the correct answer. 

After Peter had returned from the Sahara desert, he was confined to bed by a ________ disease.  

Choose the correct answer. 

Thanks to pictures taken by satellites, deserts have not ________ a mystery in our time. 

Choose the correct answer.  

In the northern part of the Simpson Desert, the dunes are separated by ________ of low, open shrubland.  

Choose the word that is closest in meaning to the underlined word. 

We used to climb up the crest of the hill to get a good view of the surroundings. 

Choose the correct answer. 

The Sahara contains complex linear dunes that are ________ by almost 6kilometers. 

Choose the correct answer. 

If the deserts are ________ managed, there may be troubles for scientific expeditions.

Choose the correct answer. 

Deserts are also classified by their ________ location and dominant weather pattern.