A. so far B. spend C. happen D. full of E. provides

For most of us in China, we only have to turn on the tap to get clean water. We seldom think twice about where it comes from.

Day after day, thousands of children in poor countries have to_______ hours walking for miles to collect water. What's more, the water is dirty and can cause serious diseases, such as diarrhea（腹泻）. It's hard to believe, but every 20 seconds a child dies as a result of a water-related disease.

The international water-aid charity called Just a Drop ______ clean water to some of the poorest areas in the world, by building wells, pipelines（水管）and toilets. The charity has helped about 1. 5 million people ______.

Betty, from Uganda, is just one of the people who have been helped by Just a Drop. 11-year-old Betty had to walk two miles every day, carrying two heavy cans ______ dirty pond water before Just a Drop placed a well in her village. "I used to get sick from the water. Now, I don't have to walk long distanced and I feel much safer with this clean water."

【1】________

【2】________

【3】________

【4】________