1. If you___ a coin,the machine___working. (insert-start) 2. __the water __ if the temperature__ 100 degrees? (boil-reach) 3. If a motorbike __enough fuel,it __ . (not have-not run) 4. If you ___this button,you __ the computer. (press-turn off) 5.The mobile phone __ if you __ its battery. (not work-not reacharge)

1. If you insert a coin,the machine starts working. 2.Does the water boil  if the temperature reaches 100 degrees? 3. If a motorbike does not have enough fuel,it does not run. 4. If you press this button, you turn off the computer. 5.The mobile phone does not work if you don't recharge  its battery.