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Across 3. to push, to help, to raise 7. in the open air 8. a sudden eruption 9. found in many places or among many people 10. increase (vb or N) 12. result, product 13. not very probable 16. state of sadness or depression 17. a solemn promise 18. a strong, forward movement like a wave

Down 1. 14 days 2. the act of closing 4. a study 5. a security measure in which people are required to remain confined in a building or at home 6. people working in a structure (shop, school, ...) 11. to lead, conduct (vb) 14. to cause to become better 15. a small part of something, or a substance, to be analysed