The phrases on the left in the following box occur in the text. Match each of them with a phrase on the right.

(i)	an endless stretch of sand	fertile place with water and plants in a desert
(ii)	waterless and without shelter	not visible because the grass is thick
(iii)	an oasis	nothing but sand as far as one can see
(iv)	hidden by a cover of grass	no water and no shade