1. Complete the zero conditional sentences using the correct form of the verbs in brackets in the correct order.
1. If you ............................ your lucky number, you ............................ happy. (feel, see)
2. If you ............................ water, it ............................. at 100 °C. (boil, heat)
3. I ............................ always exhausted the next day if I ............................ to bed very late. (be, go)
4. They ............................ the schools in America if the temperature ............................ to -20 °C. (close, drop)
5. If my sister ............................ under a ladder, she ............................ she will have bad luck. (think, walk)
6. My brother ............................ better if he ............................ exercise in the morning. (do, feel)

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