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21. If you want to save your eyesight, we must operate immediately.=> Only by
22.The workers only stopped calling for a strike when the manager promised to give a pay rise=> Only....
23. She has made good progress only within two months. => Only within two months....
24. I called the police after the burgalrs had left. => Only after.....
25. The only way you can pass the exam is learning hard. => Only by....