Complete the sentences. Use if/unless and the right form of the verb.
1) The ice cream ____(melt) ____ you ____ (leave) it in the sun.
2) ____ you ____ (break) you promise, I ____ (be) angry.
3) You ____ (not pass) your piano exam ____ you ____ (practise) every day.
4) ____ we ____ (not leave) now, we ____ (miss) the bus.

the ice-cream won`t melt unless you leave it in the sunif you`ll break your promise I`ll be angryyou won`t pass your piano exam unless you practice everydayif we won`t leave now we will miss the bus