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1. Scientists are thinking of how to use the rise and fall of the tide to produce electricity.
2. However hard life is, we have to try our best to succeed.
3. More than 15 million people in the world were thought to be affected by AIDS by 1997.
4. Shakespeare's works have inspired many writers in English playwright.
5. It is recommended that English learners study English in English speaking countries.
II/
1. Passionately
2. Energetic
3. Unsteadily
4. Publishing
5. Liquidised
