complete the sentences with if or unless1)...it039;s a nice day tomorrow,

Complete the sentences with if or unless
1)...it's a nice day tomorrow, we'll have lunch outside.
2)what will we do ... it rains?
3)the bus is late. We'll miss the beginning of the film .... it comes soon.
4).... you ring me from the station , i'll come and meet you.
5)That plant will die .... you give it some water..