1) If babies are hungry,  a) they are crying. b) they cry. c) they cried. d) they will cry. 2) If you mix hydrogen and oxygen, a) you get water. b) you'll get water. c) you've got water. d) you're getting water. 3) If plants don't get enough water, a) they'll die. b) they are dying. c) they die. d) they've died 4) If we don't drink, a) we've got thirsty. b) we're getting thirsty. c) we'll get thirsty. d) we get thirsty. 5) If it rains, a) the ground is getting wet. b) the ground will get wet. c) the ground gets wet. d) the ground got wet. 6) If the temperature is high, a) the ice is melting. b) the ice melts. c) the ice has been melting. d) the ice melted. 7) If the sun shines, a) it gets warm. b) it is getting warm. c) it got warm. d) it will get warm. 8) If the sun goes down, a) it will be dark. b) it is dark. c) it has been dark. d) it was dark.

Zero conditional

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