We got lost because we didn't have a map.
They missed their flight because they didn't wake up on time.
He wore his sunglasses because it was very sunny outside.
My teacher was angry with me because I didn't do my homework.
The fridge didn't work because it wasn't plugged in.
She had a party because it was her birthday.
The school was closed because it was school break.
She had a sore throat because she ate a lot of ice-cream.