So, Because

It was cold___I shut the window.

a. so
b. because

The door was open___I closed it.

a. so
b. because

She doesn't like him___he isn't honest.

a. so
b. because

It was raining___I took a taxi.

a. so
b. because

The water wasn't clean___we didn't swim.

a. so
b. because

We didn't swim___the water wasn't clean.

a. so
b. because

I'll be home late tonight___I have to work late.

a. so
b. because

I'm tired today___I couldn't sleep last night.

a. so
b. because

She quit her job___she is looking for a new one now.

a. so
b. because

We walked home___there were no more buses.

a. so
b. because

I closed the window___it was cold.

a. so
b. because