Complete the second sentence in each pair so that it means the same as the first.

1. My parents walk to work if it doesn't rain.
My parents walk to work unless.........................
2. I enjoy playing sport unless I'm tired.
If i'm tired, ................................
3.I wait to hear from friends before I visit them.
I don't visit friend until.............................
4. You need a passport to travel around Asia
You can travel around Asia as long as ....................