Khi nào dùng 'when' vậy giúp hiếu với ạ

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1. Scientists have invented new devices to help people live a longer life. New devices ____________________________________________ 2. I don’t have enough time , so I can’t go on holiday this summer. If ____________________________________________ 3. The man had a broken leg. He tried to save his wife. In spite ____________________________________________ 4. I can’t tell you because I don’t know the answer. If ____________________________________________ 5. They will do the test well. They will review them all hard. If ____________________________________________ 6. The rescue workers evacuated the villagers in the raged flood to the safe place last night. The villagers ____________________________________________ 7. The students will provide aids for the homeless people tomorrow. Aids ____________________________________________ 8. The people will protect the environment now. The environment will be nice If ____________________________________________ 9. They don’t have a map, so they get lost If ____________________________________________ 10. The storm destroyed many houses in this village last week. Many houses ____________________________________________ 11. Did they give food to homeless people last year? Was ____________________________________________ 12. Although the weather was bad, the football match was not canceled. Despite ____________________________________________ 13. The people will protect the environment now. The environment will be nicer If ____________________________________________ 14. They don’t have a map, so they get lost. If ____________________________________________ 15. The storm destroyed many houses in this village last week. Many houses ____________________________________________ 16. Many rivers and lakes are poisoned. Factories produce waste and pour it into rivers and lakes. (because) ____________________________________________ 17. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (so) ____________________________________________ 18. We won’t hold the festival. It costs too much money. (if) ____________________________________________ 19. The tortoise was running. The hare was sleeping. (while) ____________________________________________ 20. The girl worked hard. Her stepmother wasn’t happy. (although) ____________________________________________