1. I told a joke, but nobody laughed.
2. Last night’s storm damaged the power lines, so the town was without electricity for several hours.
3. The city suffers from air pollution and water pollution.
4. Coal and oil are valuable natural resource.
5. We must do whatever we can in order to conserve oil because il is a valuable natural resource.
6. Although they studied hard, they didn’t pass their TOEFL exam.