Read the text below and decide which answer (A, B, C or D) best fits each gap. There is an example at the beginning (0).
You’re thirsty and you (0) …GET… yourself a glass of water. Do you ever (1) ………… how old that water really is? The glass of water that you’re (2) ………… to drink may have fallen from the sky as rain only last week.
However, water itself has been around pretty much as (3) ………… as the earth has! In fact, (4) ………… oceans, seas and rivers cover 70% of the earth, there is a (5) ………… supply of water, which keeps on moving round the earth. This is (6) ………… of what’s known as the water cycle. The sun heats up water and it turns into clouds, which are (7) ………… from water vapour. When the clouds become (8) ………… , the water falls back onto the earth as rain.
Of course, clean water is absolutely essential for good health. The amount of safe drinking water has gone up around the world, but (9) ………… one billion people still lack easy (10) ………… to clean water.