If you __________ (heat) ice, it __________ (melt)., If you heat ice, it melts., If the light __________ (go) out, I __________ (change) the bulb., If the light goes out, I will change the bulb., If a pipe __________ (freeze), it __________ (burst)., If a pipe freezes, it bursts., If you __________ (not fix) the door, it __________ (stay) broken., If you do not fix the door, it will stay broken., If you __________ (press) the switch, the lamp __________ (turn) on., If you press the switch, the lamp turns on., If the handyman __________ (come) tomorrow, he __________ (repair) the faucet., If the handyman comes tomorrow, he will repair the faucet..

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