1. There are more endangered species today ________ there were 50 years ago., than, as, that, so, 2. Using renewable energy is not ________ harmful to the environment as using fossil fuels., that, as, than, so, 3. The city is growing faster ________ experts predicted., that, as, than, so, 4. Fewer forests remain today ________ existed a century ago., that, so, as, than, 5. Air pollution is not ________ severe here as in the capital., as, than, that, so, 6. This species is more endangered ________ that one., as, so, that, than, 7. Recycling is not ________ effective as reducing consumption., so, that, as, than, 8. The river is cleaner now ________ it was ten years ago., as, than, so, that, 9. Solar power is becoming as popular ________ wind power., than, so, as, that, 10. Climate change is progressing faster ________ scientists expected., as, than, that, so, 11. This area is not as polluted ________ the city center., so, than, that, as, 12. There are fewer factories here ________ there used to be., than, that, so, as, 13. The new policy is as strict ________ the old one., as, so, that, than, 14. Deforestation is happening faster ________ reforestation., that, so, as, than, 15. This method is not as costly ________ the previous one., so, that, as, than, 16. We can't release injured animals into the wild ________ they are treated and fully recovered., as long as, unless, provided that, if, 17. ________ you follow the safety rules, you may operate the machine., Because, Unless, If not, Provided that, 18. She'll join the trip ________ she can get time off work., because, unless, as long as, so that, 19. You won't succeed ________ you work harder., unless, if, as long as, provided that, 20. He can borrow the car ________ he brings it back by 6 p.m., although, as long as, because, unless, 21. ________ the weather doesn't improve, the event will be postponed., As long as, Provided that, If, Unless, 22. The plant will die ________ it gets enough water., if, unless, as long as, provided that, 23. ________ you have a valid ticket, you may enter the venue., Provided that, Because, Unless, If not, 24. She'll support the plan ________ it doesn't harm the environment., so that, because, unless, as long as, 25. ________ they invest more in renewable energy, emissions will keep rising., Provided that, Unless, If, As long as, 26. The meeting won't start ________ everyone arrives., provided that, as long as, unless, if, 27. ________ you keep the receipt, you can return the item., Unless, Because, If not, Provided that, 28. He'll continue the job ________ he receives fair pay., as long as, so that, unless, because, 29. ________ we don't act quickly, the problem will get worse., Provided that, As long as, Unless, If, 30. They won't approve the plan ________ it meets safety standards., as long as, if, unless, provided that

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