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 |