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Here are the correct forms of V for each sentence: 1. Mike enjoys **taking** in clean-up activities. 2. Students **do not go** to school on Sundays. 3. If we litter the rubbish into the rivers and beach, the water **will be** polluted. 4. My flight to Ho Chi Minh **departs** at 8:30 tomorrow. 5. We **finished** doing our homework before going to bed. 6. The boys prefer **walking** home to **taking** a taxi. 7. If he **studies** hard, he will pass the exam with flying colors. 8. Scientists **are experimenting** to reduce air pollution now. 9. The doctor advised his patients **to check** their health every 6 months. 10. My mother is busy **working** in her office.