If it rains tomorrow, we won’t have the picnic.
=> We won’t have the picnic unless _______________________________

Tom cleaned the house so that his parents would be happy.
=> Tom cleaned the house in order to _______________________________

The more you practice, the better you will become.
=> The better you become, _______________________________

In case you get lost, call me.
=> Call me _______________________________

They arrived late because of the heavy traffic.
=> They arrived late since _______________________________