IF or IN CASE?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
FILL IN THE GAPS WITH IF or IN CASE:

I’m taking my umbrella with me it rains.
I’ll open my umbrella it rains.
People phone the fire brigade their houses catch fire.
People insure their houses they catch fire.
We have a burglar alarm somebody tries to break in.
The burglar alarm will go off somebody tries to break in.
I’ll let you know I need help.
I’ll take the mobile phone I need to phone you