If heat water up to 100°,, it boils, if you break your arm,, it usually takes abput 6-8 weeks to get better, if you are in a race and you overtake the person in second place,, you're in second place, If you don't want a cold,, you should have vitamin C, If you see a red flag at the beach,, you shouldn't go swimming., If you are in Buenos Aires and you need the police,, you should call the 911, If there's a fire in a building,, you shouldn't use the lift

4th Senior- unit 6 Zero conditional

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