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Question. Researchers are developing low-cost devices. These devices can detect water pollutants in rivers and lakes.

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Question. Water always boils when you heat it long enough.

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Question. I think you should tell your parents the truth.

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Question. Most Superstar City Dwellers are quite happy with their life and work. Barbara and Mark are quite happy, too.

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Question. You use your mobile phone a lot, so you have large phone bills.

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Question. Plants and flowers can't live without water.

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Question. My computer always crashes when a CD is inserted.

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Question. Urban planners carry out projects to develop a city. They look at the needs of local people and the environment when they do this.

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Question. Mary doesn’t like sport. Her two brothers don’t, either.

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Question. The infrastructure of our city needs upgrading. It's in an extremely poor condition now.

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Question. Wastewater is treated and turned into drinking water. This is done to ensure there is no shortage of fresh water.

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Question. I hardly know the truth about Jean’s success in the institute.

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Question. The old man is working in this factory. I borrowed his bicycle yesterday.

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Question. “Go on Jack, apply for the job” said Mary.

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Question. Some kinds of fish live in fresh water. Others live in sea water.